books.google.com - This book provides a comprehensive exposition of the use of set-theoretic methods in abelian group theory, module theory, and homological algebra, including applications to Whitehead's Problem, the structure of Ext and the existence of almost-free modules over non-perfect rings. This second edition is...http://books.google.com/books/about/Almost_Free_Modules.html?id=4ei5WzgnnM4C&utm_source=gb-gplus-shareAlmost Free Modules
