These files are extracted from the SAILDART archive maintained by Bruce Baumgart, in Douglas Lenat's AM section here: https://www.saildart.org/[AM,DBL]/
"There was literally an ancient wizard who created a hidden artifact with legendary power, that he never shared with the world, until when he died, the seals (password on the directory) broke and the artifact was revealed" - Daj
The whole program is contained in EUR, including general heuristics. Searching all of SAILDART for any RLL, TCS, or related heuristics & input data for specific domains has all come up empty. The timestamp on EUR was months before the 1981 TCS event, and the code is lacking some infrastructure described in the later papers. But it can be run.
seveno4 got it running in Medley Interlisp with only minor changes. If you're seeking to actually run it, look there. This repo is for the unmodified original and commentary on it.
The wiki is active and open for anyone to post their knowledge and discoveries.
SAILDART's usage of "←" and "↑" were how those character's glyphs looked, but their original character codes mean "_" and "^" respectively in today's ASCII. EUR only uses "←", in its "Snazzy" GUI code. You probably need to change those characters to "_" in order to have the source file interpreted properly in Interlisp as plain 8-bit characters in the original pre-ASCII encoding.
I'm slowly working on a direct Common Lisp port here.
Discord: https://discord.gg/vhsmVCwgvK