Philosophy and Fun of Algebra

Title: Philosophy and Fun of Algebra
Author: Mary Everest Boole
Description: Project Gutenberg-tm License
Format: PDF
Price: Free
Download Now

A First Book in Algebra

Title: A First Book in Algebra
Author: Wallace C. Boyden 
Description: Project Gutenberg-tm License
Format: PDF
Price: Free
Download Now

Model Theory, Algebra, and Geometry

Title: Model Theory, Algebra, and Geometry
Authors: Deirdre Haskell, Anand Pillay, and Charles Steinhorn
Description: Model theory is a branch of mathematical logic that has found applications in several areas of algebra and geometry. It provides a unifying framework for the understanding of old results and more recently has led to significant new results, such as a proof of the Mordell-Lang conjecture for function fields in positive characteristic. Perhaps surprisingly, it is sometimes the most abstract aspects of model theory that are relevant to these applications.
Format: Postscript, PDF
Price: Free at the time it was posted here.
Download directly from the source
Source: http://library.msri.org/books/Book39/contents.html

Abstract Algebra: Theory and Application 2010 Edition

Title: Abstract Algebra: Theory and Application 2010 Edition
Author: Thomas W Judson
Description: An Open Source Textbook on Abstract Algebra
Format: PDF
Price: FREE (Open Source)
Download directly from the original source
2010 Edition (2.2 mb) August 27, 2010 source: http://abstract.ups.edu/download/aata-20100827.pdf
2009 Edition (1.5 mb) February 14, 2009 source: http://abstract.ups.edu/download/aata-original.pdf
Download Now (Mirror Site)
2010 Edition
2009 Edition