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    As Hoare said of ALGOL 60: “Here is a language so far ahead of its time, that it was not only an improvement on its predecessors, but also on nearly all its successors”

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      ALGOL 60 Implementation by Randell and Russell is a fantastic introduction to writing an Algol compiler. The techniques described became the standard way of doing things for a decade or two, with many still in use.

      Lots of other interesting stuff at softwarepreservation.org