The reason I have posted this as a comment, rather than via email is because too often have I been looking for solutions to a problem, only to discover a solution was found and emailed to someone else -- denying myself and others access to the solution!
If those don't provide MacLisp (I think the TOPS-20 image should), then you might be able to find it (or a link that sets you on the right track) here: http://www.softwarepreservation.org/projects/LISP/maclisp_fa...
A manual for MacLISP is here, by the way: http://www.maclisp.info/pitmanual/meta-index.html Some assorted software for the PDP-10 is here (Including TECO!): http://pdp-10.trailing-edge.com/
The reason I have posted this as a comment, rather than via email is because too often have I been looking for solutions to a problem, only to discover a solution was found and emailed to someone else -- denying myself and others access to the solution!