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Scheme Language 
The Scheme Programming Language, 3rd edition (R. Kent Dybvig) [2nd Edition]
Concrete Abstractions: An Introduction to Computer Science Using Scheme (Ma. Hailperin, et al)
How to Use Scheme (by M. Felleisen, et al) Schematics Scheme Cookbook
Learn Scheme Now (PDF) An Introduction to Scheme and its Implementation [Mirror]