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Since this post got quite popular I decided to incorporate some of the excellent suggestions posted in the comments, so this list now has more than 30 books in it. [UPDATED: 2010-10-10] Learning a new programming language always is fun and there are many great books legally available for free online. Hereâs a selection of 30 of them: Lisp/Scheme: How to Desing Programs Let Over Lambda On Lisp
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