The Free On-line Dictionary of Computing (30 December 2018):

LISP70
VEL

   A Lisp dialect descended from MLISP and MLISP2.  Also
   known as PLISP and VEL.  Useful for parsing.  Only the
   pattern-matching system was published and fully implemented.
   According to Alan Kay, LISP70 had an influence on
   Smalltalk-72.  "The LISP70 Pattern Matching System, Larry
   Tesler et al, IJCAI 73.