ebooks

Ubuntu UNLEASHED 2010 Edition

by Andrew Hudson

Paul Hudson

Matthew Helmke

Ryan Troy

http://www.desifile.com/files/23767235637/Sams.Ubuntu.Unleashed.2010.Edition.Dec.2009.pdf

Ubuntu UNLEASHED 2008 Edition

by Andrew Hudson

Paul Hudson

ISBN 978-0-672-32993-7

http://www.desifile.com/files/24078348748/Sams.Ubuntu.Unleashed.2008.Edition.Jul.2008.pdf

FedoraÆ 10 and Red HatÆ Enterprise LinuxÆ Bible

by Christopher Negus

Eric Foster-Johnson

Published by

Wiley Publishing, Inc.

ISBN: 978-0-470-41339-5

http://www.desifile.com/files/76282762376/Fe10andReHaEntLinBib2009.pdf 

Ubuntu

UNLEASHED

2008 Edition

by Andrew Hudson

Paul Hudson

http://www.desifile.com/files/76776263737/067232993X.pdf 

Fedora 7 & Red HatÆ Enterprise

Linux: The Complete Reference

by Richard Petersen

http://www.desifile.com/files/77262367237/F.463475573.pdf 

LINUX

IN A NUTSHELL

Sixth Edition

by Ellen Siever, Stephen Figgins, Robert Love,

and Arnold Robbins

http://www.desifile.com/files/78692372362/Oreilly.Linux.in.a.Nutshell.6th.Edition.Sep.2009.pdf 

Beginning

Fedora

From Novice to Professional

by Shashank Sharma and Keir Thomas

http://www.desifile.com/files/78786756455/Apress.Beginning.Fedora.From.Novice.to.Professional.Jul.2007.pdf 

FedoraÆ Bible 2010 Edition

Featuring Fedora LinuxÆ 12

by Christopher Negus

Eric Foster-Johnson

http://www.desifile.com/files/79723652365/0470554193Fedora.pdf 

The Official Ubuntu Book

Fifth Edition

by Benjamin Mako Hill

Matthew Helmke

Corey Burger

http://www.desifile.com/files/79867376322/0137081308.pdf 

Pro Drupal Development

SeconD eDition

by John K. VanDyk

http://www.desifile.com/files/79972367326/Pro Drupal Development, Second Edition.pdf 

Beginning UnixÆ

by Paul Love, Joe Merlino, Craig Zimmerman,

Jeremy C. Reed, and Paul Weinstein

Published by

Wiley Publishing, Inc.

http://www.desifile.com/files/53487267236/Wrox - Beginning Unix.pdf 

Installing and

Administering Linux

Second Edition

by Linda McKinnon

Al McKinnon

http://www.desifile.com/files/57487243764/0471208841.pdf 

Beginning

Ubuntu Server

Administration

From Novice to Professional

by Sander van Vugt

http://www.desifile.com/files/59789783783/Apress.Beginning.Ubuntu.Server.Administration.From.Novice.to.Professional.pdf 

Running Linux, 4th Edition

by Matthias Kalle Dalheimer

Terry Dawson

Lar Kaufman

Matt Welsh

Publisher: O'Reilly

December 2002

ISBN: 0-596-00272-6, 692 pages

http://www.desifile.com/files/60765265122/O_Reily_-_Running_Linux._-_4th_Edition.pdf 

Embedded

FreeBSD Cookbook

by Paul Cevoli

ISBN: 1-5899-5004-6

http://www.desifile.com/files/64534543435/Embedded_20FreeBSD_20Cookbook_20_2002_.pdf 

BSD Hacks

By Dru Lavigne

 

Publisher : O'Reilly

Pub Date : May 2004

ISBN : 0-596-00679-9

Pages : 300

http://www.desifile.com/files/97878713123/BSD_Hacks__O_Reilly-2004_.chm

Building Embedded Linux Systems 

By Karim Yaghmour 

   

Publisher : O'Reilly 

Pub Date : April 2003 

ISBN : 0-596-00222-X 

Pages : 416 

Slots : 1 

http://www.desifile.com/files/11272367237/o_27reilly_-_building_embedded_linux_systems.chm

Linux® Bible 2010 Edition

Boot Up to Ubuntu®, Fedora®,

KNOPPIX, Debian®, openSUSE®,

and 13 Other Distributions

by Christopher Negus

http://www.desifile.com/files/20578236723/Linux Bible 2010 Edition.pdf

Fedora® Bible 2010 Edition

Featuring Fedora Linux® 12

by Christopher Negus

Eric Foster-Johnson

Published by

Wiley Publishing, Inc.

ISBN: 978-0-470-55419-7

http://www.desifile.com/files/20976236733/0470554193Fedora.pdf

Sams Teach Yourself Shell Programming in 24 Hours 

http://www.desifile.com/files/12475247897/Teach_Yourself_Shell_Programming_in_24_Hours.pdf

Teach Yourself UNIX in 24 Hours

Dave Taylor

James C. Armstrong, Jr.

http://www.desifile.com/files/15749635787/Teach Yourself Unix in 24 Hours.pdf

Advanced Linux 

Programming 

Mark Mitchell, Jeffrey Oldham, 

and Alex Samuel 

http://www.desifile.com/files/16894261826/Advanced_Linux_Programming.pdf

Linux+ Certification Bible

Trevor Kay

http://www.desifile.com/files/17291581518/HungryMinds - Linux+ Certification Bible.pdf

Programming Linux Games 

John R. Hall 

Loki Software, Inc. 

http://www.desifile.com/files/17781525627/linux games programming.pdf

UNIX in a Nutshell: System V Edition. 

By Daniel Gilly & the Staff of O'Reilly & Associates; ISBN 1-56592-001-5, 444 pages. 

Second Edition, June 1992. 

http://www.desifile.com/files/30618151718/[OReilly]-Unix_In_a_Nutshell.pdf

Linux® Bible 2007 Edition

Boot Up Ubuntu®, Fedora™, KNOPPIX,

Debian®, SUSE™, and 11 Other Distributions

by Christopher Negus

Published by

Wiley Publishing, Inc.

ISBN: 978-0-470-08279-9

http://www.desifile.com/files/24293984849/linux-bible-2007-edition-boot-up-ubuntu-fedora-knoppix-debian-suse-and-11-other-distributions.9780470082799.27280.pdf

Fedoraô UNLEASHED 2008 Edition

by Andrew Hudson

Paul Hudson

ISBN 978-0-672-32977-7

http://www.desifile.com/files/25567327387/F.4432464326.pdf

Linux® Bible 2007 Edition

Boot Up Ubuntu®, Fedora™, KNOPPIX,

Debian®, SUSE™, and 11 Other Distributions

by Christopher Negus

http://www.desifile.com/files/24389484048/Wiley.Linux.Bible.2007.Edition.Mar.2007.pdf

LinuxÆ Bible

2008 Edition

Boot Up to UbuntuÆ, FedoraÆ, KNOPPIX,

DebianÆ, openSUSEÆ, and 11 Other Distributions

by Christopher Negus

ISBN: 978-0-470-23019-0

http://www.desifile.com/files/27228382390/Wiley.Linux.Bible.2008.Edition.Feb.2008.pdf

LinuxÆ Bible

2009 Edition

Boot Up to UbuntuÆ, FedoraÆ,

KNOPPIX, DebianÆ, SUSEÆ, and

13 Other Distributions

by Christopher Negus

ISBN: 978-0-470-37367-5

http://www.desifile.com/files/29387346734/0470373679.pdf

Understanding the Linux Kernel 

Daniel P. Bovet 

Marco Cesati 

Publisher: O'Reilly 

First Edition October 2000 

ISBN: 0-596-00002-2, 702 pages 

http://www.desifile.com/files/52512576908/O'Reilly - Understanding The Linux Kernel.pdf

Integrating Linux and Windows 

By Mike  McCune 

    

Publisher : Prentice Hall PTR 

Pub Date : December 19, 2000 

ISBN : 0-13-030670-3 

Pages : 416

http://www.desifile.com/files/64241087456/Mike McCune. Integrating Linux and Windows (Prentice Hall PTR).pdf

Complete Idiot's Guide to Linux 

(Publisher: Macmillan Computer Publishing) 

Author(s): Manuel Ricart 

ISBN: 078971826x 

Publication Date: 12/22/98 

http://www.desifile.com/files/23223409786/Complete Idiot's Guide to Linux.pdf

Title: Securing and Optimizing Linux: 

RedHat Edition 

ISBN: 0-9700330-0-1 

Author's: Gerhard Mourani 

Mail: gmourani@openna.com 

Page Count: 486 

Version: 1.3 

Last Revised: June 07, 2000

http://www.desifile.com/files/41824139808/Securing_Optimizing_Linux_RH_1.3.pdf

Linux Network Administrator's 

Guide, 2nd Edition 

By Olaf Kirch & Terry Dawson 

2nd Edition June 2000 

1-56592-400-2, Order Number: 4002 

506 pages, $34.95 

http://www.desifile.com/files/90724179656/Linux_Network_Administrator's_Guide_Second_Edition.pdf

Sams Teach Yourself KDE in 24 Hours

by Sams Publishing

ISBN: 0-672-31608-0

http://www.desifile.com/files/71648599686/Teach_Yourself_KDE_In_24_Hours.pdf

UNIX UNLEASHED 

Richard K. Swadley

SAMS Publishibng 

International Standard Book Number: 0-672-30402-3

http://www.desifile.com/files/73495378558/Unix_Unleashed.pdf

Teach Yourself Linux In 24 Hours

http://www.desifile.com/files/05576865487/Teach_Yourself_Linux_In_24_Hours.pdf

Linux Device Drivers

Alessandro Rubini & Jonathan Corbet

OReilly

http://www.desifile.com/files/07236546543/[OReilly]-Linux_Device_Drivers.pdf

Red Hat Linux 7.2 Bible

http://www.desifile.com/files/10468763678/Red Hat Linux 7.2 Bible.pdf

Beginning Ubuntu Linux

The complete guide to Ubuntuóincludes

everything you need to take advantage of

the worldís favorite Linux operating system.

FOURTH EDITION

by Keir Thomas and Andy Channelle with Jaime Sicam

http://www.desifile.com/files/71327621562/beginning-ubuntu-linux-fourth-edition.9781430219996.49031.pdf 

Fedoraô UNLEASHED

2008 Edition

by Andrew Hudson

Paul Hudson

http://www.desifile.com/files/75782367236/F.4432464326.pdf 

Beginning Ubuntu Linux

From Novice to

Professional,

Fourth Edition

by Keir Thomas and Andy Channelle

with Jaime Sicam

http://www.desifile.com/files/75852365236/Beginning%20Ubuntu%20Linux,%20Fourth%20Edition%20(2009).pdf 

Learning the Unix Operating System. 

By Jerry Peek, Grace Todino & John Strang; ISBN 1-56592-390-1, 106 pages. 

http://www.desifile.com/files/37398167167/Learning the UNIX Operating System.pdf

ebooks

Beginning

Ruby on Rails

E-Commerce

From Novice to Professional

by Christian Hellsten and Jarkko Laine

http://www.desifile.com/files/79523932782/Beginning Ruby on Rails E-Commerce, Apress (2006).pdf

Flexible Rails

FLEX 3 ON RAILS 2

by PETER ARMSTRONG

ISBN 1-933988-50-9

http://www.desifile.com/files/52078167121/Manning.Flexible.Rails.Flex.3.on.Rails.2.Jan.2008.pdf

Security on Rails

by Ben Poweski

David Raphael

ISBN-10: 1-934356-48-4

http://www.desifile.com/files/57078236723/Pragmatic - Security on Rails (December 2009) (ATTiCA).pdf

ebooks

Mac OS® X UNIX®

Tool box

by Thomas Myer

Christopher Negus

François Caen

http://www.desifile.com/files/14182726287/MAC.pdf

Learn Objective-C

for Java Developers

by James Bucanek

http://www.desifile.com/files/17916723763/Apress,.Learn.Objective-C.for.Java.Developers.(2009).[1430223693].pdf

AUTOCAD AUTOCAD 2010 2010

ESSENTIALS ESSENTIALS

by Munir M. Hamad

ISBN 978-0-7637-7629-9

http://www.desifile.com/files/19778321762/AutoCAD 2010 Essentials.pdf

Pro ToolsR for

Video, Film, and

Multimedia,

Second Edition

by Ashley Shepherd

http://www.desifile.com/files/20078213672/Pro_Tools_for_Video.pdf

AUTODESK® INVENTOR® 2010

NO EXPERIENCE REQUIRED

by Thom Tremblay

http://www.desifile.com/files/20867126533/0470481692 2010  No Experience1.pdf

Introducing

AutoCAD®

Civil 3D® 2010

by James Wedding, P. e .

Rick gRaham

ISBN: 978-0-470-48152-3

http://www.desifile.com/files/23909488749/0470481528 Civil 3D 20101.pdf

Mastering

AutodeskÆ InventorÆ 2010

by Curtis Waguespack

Loren Jahraus, P.E.

by ISBN: 978-0-470-47830-1

http://www.desifile.com/files/25223783873/0470478306  Inventor 20101.pdf

iPhone The Missing Manual

BY DaviD Pogue

August 2009: Third Edition

ISBN: 978-0-596-80429-9

http://www.desifile.com/files/25767235637/ddlworld.info_ifon_The_Missing_Manual.pdf

Mastering

AutodeskÆ 3ds MaxÆ

Design 2010

by Mark Gerhard

Jeffrey M. Harper

Jon McFarland

ISBN: 978-0-470-40234-4

http://www.desifile.com/files/26863769789/Masterring_Autodes_3ds_max.pdf

Photoshop CS5: The Missing Manual

by Lesa Snider

Published by OíReilly

ISBN: 9781449381684

http://www.desifile.com/files/26978376373/Oreilly - Photoshop CS5 The Missing Manual (2010) (ATTiCA).pdf

JavaÆ and Mac OSÆ X

by T. Gene Davis

Published by

Wiley Publishing, Inc.

ISBN: 978-0-470-52511-1

http://www.desifile.com/files/27093387381/Java.and.Mac.OS.X.pdf

Mastering

AutoCADÆ Civil 3DÆ 2010

by James Wedding

Scott McEachron

ISBN: 978-0-470-47353-5

http://www.desifile.com/files/27489378389/Mastering_AutoCAD_Civil_3D_2010_Sybex.pdf

AutoCADÆ 2010 &

AutoCAD LTÆ 2010 Bible

by Ellen Finkelstein

Published by

Wiley Publishing, Inc.

ISBN: 978-0-470-43640-0

http://www.desifile.com/files/28897878738/0470436409 CAD  2010 Bible1.pdf

iPhone Hacks

April 2009: First Edition

by David Jurick, Adam & Damien Stolarz

ISBN-13: 978-0-596-51664-2

http://www.desifile.com/files/29678367376/OReilly.iPhone.Hacks.Apr.2009.pdf

The Ultimate Guide to Graphic Design

 Edition 2 2010 

http://www.desifile.com/files/30278236733/The_Ultimate_Guide_to_Graphic_Design_Edition_2_2010_GFXTRA.COM.pdf

ebooks

Deconstructing the Elements with 3ds Max

create natural fire, earth, air and water without plug-ins

by Pete Draper

Autodesk

http://www.desifile.com/files/20065671267/Deconstructing_the_Elements_with_3ds_Max_2nd_Ed.pdf

Modeling a Character in

3ds maxÆ

Second Edition

Paul Steed

Wordware Publishing, Inc.

ISBN 1-55622-088-X

http://www.desifile.com/files/20161232312/Modeling_a_Character_in_3DS_Max__2nd_Edition.pdf

Neurology in Clinical Practice

Principles of Diagnosis and Management

Fourth Edition-

Walter G. Bradley, D.M., F.R.C.P

Robert B. Daroff, M.D,

Gerald M. Fenichel, M.D.

Joseph Jankovic, M.D.

http://www.desifile.com/files/20265125421/0750674695.pdf

Framework Design Guidelines

Conventions, Idioms, and Patterns for Reusable .NET Libraries

Second Edition

Krzysztof Cwalina

Brad Abrams

http://www.desifile.com/files/20361252677/Framework Design Guidelines 2nd Edition.pdf

Video Production Handbook

Fourth Edition

Gerald Millerson

Jim Owens, Asbury College

ISBN: 978-0-240-52080-3

http://www.desifile.com/files/20445116787/0240520807Video.pdf

Silverlight 2 UNLEASHED

by Laurent Bugnion

ISBN 978-0-672-33014-8

Pub Pearson Education, Inc.

http://www.desifile.com/files/20511115156/Sams Silverlight 2 Unleashed.pdf

Beginning Xcode 

byJames Bucanek 

Wrox Press 2006 (620 pages) 

ISBN:047175479X 

Featuring step-by-step instructions that can be applied directly to your projects, this book covers the basic fundamentals of Xcode development and shows you how it can help you achieve a seamless, comfortable, and productive working environment.

http://www.desifile.com/files/20652332677/Wrox.Beginning.Xcode.chm

Options, FUtures, And other Derivatives

by John C. Hull

5th Edition

http://www.desifile.com/files/20711156156/Hull-Options, Futures And Other Derivative Securities, 5Th Ed.pdf

Beginning ASP.NET 3.5 in VB 2008

From Novice to Professional

SEcoND EDiTioN

Matthew MacDonald

ISBN-13 (pbk): 978-1-59059-892-4

http://www.desifile.com/files/20811156165/Beginning ASP.NET 3.5 in VB 2008.pdf

After Effects Apprentice

Real-World skills for the Aspiring Motion Graphics Artist

Trish and Chris Meyer

2nd Edition version CS4

ISBN: 978-0-240-81136-9

http://www.desifile.com/files/20921356325/After Effects Apprentice,Second Edition.Trish.Focal.2009.pdf

ebooks

Programming Pearls, 

      Second Edition 

by Jon Bentley. 

Addison-Wesley, Inc., 2000. 

ISBN 0-201-65788-0. 

239 + xi pp.   $24.95 

http://www.desifile.com/files/04574541265/programming-pearls-2nd-edition.9780201657883.23633.pdf

Programming Pearls, 

      Second Edition 

by Jon Bentley. 

Addison-Wesley, Inc., 2000. 

ISBN 0-201-65788-0. 

239 + xi pp.   $24.95 

http://www.desifile.com/files/91486573243/programming-pearls-2nd-edition.9780201657883.23633.pdf

Perl Cookbook 

By Tom Christiansen & Nathan Torkington; ISBN 1-56592-243-3, 794 pages. 

First Edition, August 1998.

http://www.desifile.com/files/73046123789/O'Reilly Perl Cookbook.pdf

Mastering Regular Expressions 

Powerful Techniques for Perl and Other Tools 

Jeffrey E.F. Friedl 

O'REILLY 

http://www.desifile.com/files/11396237328/[OReilly]-Mastering_Regular_Expressions.pdf

Advanced Perl Programming

By Sriram Srinivasan; ISBN 1-56592-220-4, 434 pages. 

First Edition, August 1997. 

http://www.desifile.com/files/12780462345/Advanced Perl Programming.pdf

Learning Perl 

By Randal Schwartz, Tom Christiansen & Larry Wall; ISBN 1-56592-284-0, 302 pages. 

Second Edition, July 1997. 

http://www.desifile.com/files/13883583534/Learning Perl.pdf

Programming Perl 

By Larry Wall, Tom Christiansen, & Randal Schwartz; 1-56592-149-6, 646 pages. 

2nd Edition, September 1996 

http://www.desifile.com/files/14584747746/Programming_Perl.pdf

Teach Yourself Perl 5 in 21 days 

David Till 

http://www.desifile.com/files/30169367528/(ebook-pdf) - Teach Yourself Perl 5 in 21 Days - David Till.pdf

OReilly Perl and XML

http://www.desifile.com/files/37678916728/OReilly Perl and XML.pdf

Network  Programming  with Perl 

Graham Barr 

http://www.desifile.com/files/38367815761/Network_Programming_with_Perl.pdf

ebooks

http://www.desifile.com/files/76978634532/ajax.chm
http://www.desifile.com/files/15685869087/O'Reilly - Java Script And DHTML Cookbook.chm
http://www.desifile.com/files/19786955444/O'Reilly. - XML in a Nutshell. Second Edition.chm
http://www.desifile.com/files/51246453706/O'Reilly - Erik T. Ray. Learning XML, First Edition.pdf
http://www.desifile.com/files/59807432134/JavaScript The Definitive Guide.pdf
http://www.desifile.com/files/68352412465/Wrox Press. - Professional XML Databases.pdf
http://www.desifile.com/files/40742156734/[0130897930]Core Web Programming 2nd Edition.chm
http://www.desifile.com/files/41424379788/[Wiley] Inside XML.pdf
http://www.desifile.com/files/41798032455/[SAMS] Strategic XML.pdf
http://www.desifile.com/files/52763421398/Oreilly.HTML.And.XHTML.The.Definitive.Guide.5th.Edition.iNT.eBook-LiB.chm
http://www.desifile.com/files/91053123432/MS.Press.XML.Web.Services.In.The.Organization.chm
http://www.desifile.com/files/96052125364/OReilly XML Pocket Reference 2nd.pdf
http://www.desifile.com/files/98324316875/JavaScript_Bible_Gold_(2001).pdf
http://www.desifile.com/files/28559363433/HungryMinds - XML Bible, Second Edition.pdf
http://www.desifile.com/files/37560584743/For.Dummies.Ajax.For.Dummies.Feb.2006.pdf
http://www.desifile.com/files/38148569796/Wrox Press. - Professional XML Databases.pdf
http://www.desifile.com/files/67135212365/[MSPress] XML Programming.chm
http://www.desifile.com/files/72992617364/Manning.Ajax.in.Action.Oct.2005.pdf
http://www.desifile.com/files/05016876577/Sams. Pure JavaScript - Second Edition.pdf
http://www.desifile.com/files/06168758778/Morgan Kaufmann Publishers - System Architecture with XML.pdf
http://www.desifile.com/files/10056732567/XMLBible.pdf
http://www.desifile.com/files/10568226665/ebook OReilly Web Design Nutshell.pdf
http://www.desifile.com/files/14082946365/(ebook) - O'Reilly - HTML the definite guide.pdf
http://www.desifile.com/files/16260151567/Developing XML Solutions.chm
http://www.desifile.com/files/17822343547/Programming - XML By Example.pdf
http://www.desifile.com/files/18895252656/xml_visual_quickstart_guide.pdf
http://www.desifile.com/files/30998267287/[OReilly] XPath_and_XPointer.pdf
http://www.desifile.com/files/32478614513/[OReilly] XSLT.pdf
http://www.desifile.com/files/33916512626/[MSPress] XML_In_Action.chm
http://www.desifile.com/files/36519171676/XML Application Developer's Guide (JBuilder).pdf
http://www.desifile.com/files/36927629826/The Book of SAX - The Simple API for XML.pdf
http://www.desifile.com/files/37589178168/JavaScriptBible.pdf
http://www.desifile.com/files/37857178156/Complete Idiot's Guide to JavaScript.pdf
http://www.desifile.com/files/38281891789/Javascript_Book.pdf










Ajax for Web Application Developers By Kris Hadlock

JavaScript & DHTML Cookbook By Danny Goodman

XML in a Nutshell, 2nd Edition By Elliotte Rusty Harold, W. Scott Means

Learning XML Erik T. Ray

JavaScript: The Definitive Guide By David Flannagan

Professional XML Databases

Core Web Programming, Second Edition By Marty Hall, Larry Brown

Inside XML Steven Holzner

Strategic XML W. Scott Means

HTML & XHTML: The Definitive Guide, 5th Edition By Bill Kennedy, Chuck Musciano

XML Web Services in the Organization by Chris Boar

XML Pocket Reference, 2nd Edition Robert Eckstein & Michel Casabianca

JavaScript®Bible, Gold Edition Danny Goodman

XML Bible Second Edition Elliotte Rusty Harold

Ajax FOR DUMmIES‰ by Steve Holzner,PhD

Professional XML Databases KevinWilliams

XML Programming (Core Reference) / R. Allen Wyke, Sultan Rehman, Brad Leupen.

Ajax in Action DAVE CRANE ERIC PASCARELLO WITH DARREN JAMES

Pure JavaScript, Second Edition

System Architecture with XML Berthold Daum Udo Merten

XML ™ Bible Elliotte Rusty Harold

Web Design in a Nutshell by Jennifer Niederst

HTML: The Definitive Guide. By Chuck Musciano & Bill Kennedy

Developing XML Solutions Jake Sturm.?

xml by example

xml visual quick start guide

XPath and XPointer John E. Simpson

[OReilly] XSLT

XML in Action William J. Pardi?

XML Application Developer's Guide

The Book of SAX The Simple API for XML W.Scott Means, Michael A. Bodie

JavaScript Bible 4th Edition Danny Goodman

Complete Idiot's Guide to JavaScript

VOODOO’S INTRODUCTION TO JAVASCRIPT by Stefan Koch