The LISP 1.6 Programmer's Manual IS SAILON-28, LISP.WD[S,DOC].
VARIANTS OF LISP USING M-EXPRESSIONS
CALLED RLISP BY TONY HEARN AND MLISP BY DAVE SMITH ARE ALSO
AVAILABLE.   A prospectus on the future glories of LISP 70 has
been published by Horace Enea, Dave Smith, and Larry Tesler.

HELP is available under the headings MLISP, MLISP2, and ILISP
about the use of those versions of LISP.

The files RLISP.ACH[S,DOC], MLISP.DAV[AIM,DOC],
and MLISP2.DAV[AIM,DOC] are the reference manuals for those
LISP dialects.

Currently, the only LISP that is maintained is MACLISP, the MIT
dialect. Help for that version and other goodies can be found by doing
"HELP MACLISP".