[TUHS] Harvard's PPL, Polymorphic Programming Language

[Lars Brinkhoff via TUHS]

Hello,

I recently discovered a copy of the PPL "Polymorphic Programming Langauge".
https://github.com/PDP-10/harvard-ppl

Even though it seems to have enjoyed over a decade as an educational
tool, it seems to have dissapeared almost without a trace.  The
Wikipedia page is very sparse.

On topic for TUHS, PPL was ported to Unix and used at "several
universities".  Has anyone seen this programming language in the
archives?