;  LOGO Language Interpreter for the Apple-II-Plus Personal Microcomputer
;  Written and developed by Stephen L. Hain, Patrick G. Sobalvarro,
;  and the M.I.T. LOGO Group, at the Massachusetts Institute of
;  Technology.

It’s over on github: https://github.com/PDP-10/its/blob/master/src/aplogo/logo.958