qmpl and sol2 were obtained from:

http://www.cheswick.com/ches/archives/qmpl
http://www.cheswick.com/ches/archives/sol2

http://www.cheswick.com/ches/archives/index.html reads:

Source code for some old CDC programs used at Lehigh and Temple University

Some of these files contain routines that are copyright circa 1970 by Control Data Corporation. If anyone has legal objections to the publication of any of this software here, please let me know.

I have some notes on early computer projects that are related to some of these programs.

    Chess 4.2 (Update source deck).
    Chess 4.2 (** update pl! **).
    console games (Update source deck).
    localpl1 from Lehigh (Update source deck).
    localpl2 from Lehigh (Update source deck).
    qmpl: not sure exactly which pl (Update source deck).
    senator: a line editor (Update source deck).
    sol2: Steve Lidie's PL (Update source deck).