Here you can find some linux manuals I've downloaded in pdf (Adobe Acrobat) format. None of this stuff is mine, so don't bother me with errata reports or anything; contact the original author if you believe there's an error in there. Some Linux reference books in pdf format.
 
- Linux one page manual
Summary of the most frequently used linux commands.Author: John Hacking
Homepage: www.powerup.com.au/~squadron
Pages: 2
- Linux newbie administrators guide
Guide written by redhat ex-newbies to ease the learning curve of other newbies.Author: Stan and Peter Klimas
Homepage: sunsite.auc.dk/linux-newbie/
Pages: 149
- Linux complete command reference
A complete Linux reference manual covering all linux commands.Author: Dean Miller
Homepage: www.mcp.com
Pages: 1527
- Linux sysadmin guide
An introduction to sytem administration of a Linux system for novices.Author: Lars Wirzenius
Homepage: liw.iki.fi/liw/
Maintainer: Joanna Oja
Homepage: www.iki.fi/viu/
Latest version: www.tcm.hut.fi/~viu/linux/sag/
Pages: 104
- The complete Gimp manual
A manual about creating images with the GNU Image Manipulation Program.Author: Karin Kylander & Olof S. Kylander
Homepage: www.coriolis.com
Pages: 924
- Gimp manual: color section
The colour section that goes with the Gimp Manual.Author: Karin Kylander & Olof S. Kylander
Homepage: www.coriolis.com
Pages: 32
- The art of Assembly
A manual that covers the art of programming in assembly, being: raw machine code.Author: Randall Hyde
Homepage: http://webster.cs.ucr.edu
Pages: 1365
- Thinking in Java, 1st ed.
A very good book on writing JAVA applications.Author: Bruce Eckel
Homepage: www.bruceeckel.com
Pages:848
- Thinking in Java, 2nd ed.
Second edition of Eckel's book on writing JAVA applications.Author: Bruce Eckel
Homepage: www.bruceeckel.com
Pages:848
- Thinking in C++, 2nd ed.
First part of the Thinking in C++ book by the same author of the famous "Thinking in Java" book.Author: Bruce Eckel
Homepage: www.bruceeckel.com
Pages:623
- Thinking in C++, 2nd ed.
Second part of the Thinking in C++ book by the same author of the famous "Thinking in Java" book.Author: Bruce Eckel
Homepage: www.bruceeckel.com
Pages:602