Machine readable parts of various Scheme books

lang/scheme/bookcode/

   aibook/    AIbook: Code from Kreutzer and McKenzie's AI 
              book.
   eopl/      EOPL: Code from Friedman, Wand, and Haynes' book 
              "Essentials of Programming Languages".
   queinnec/  LiSP: Code from Christian Queinnec's "Les 
              Langages Lisp" book
   sap/       SAP: Code from Springer and Friedman's book 
              "Scheme and the Art of Programming"
   sicp/      SICP: Code from Abelson and Sussman's book 
              "Structure and the Interpretation of Computer 
              Programs"
   ssics/     SSICS: Code from Harvey and Wright's book "Simply 
              Scheme"