After going through two Schemer books, I'm going to start HtDP, but I also found http://docs.plt-scheme.org/guide .
The previously mentioned books are more specific to the Scheme, and it seems that the latter are more focused on specific PLT extensions (modules, requirements, parenthesis syntax, etc.). The online guide is great, but I was hoping there might be a book that I could buy?
If not, I am certainly grateful for the in-depth online guide - it was just curious!
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