Added How to Design Programs to Racket section.

bf3097dd · John Berry · deeda8cc · bf3097dd
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free-programming-books.md free-programming-books.md +1 -0

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 ### Racket
+* [How to Design Programs 2e](http://www.ccs.neu.edu/home/matthias/HtDP2e/)
 * [Programming Languages: Application and Interpretation](http://cs.brown.edu/courses/cs173/2012/book/index.html)
 * [The Racket Guide](http://docs.racket-lang.org/guide/index.html)