(PL/C) A large subset of PL/I from Cornell University, aimed at novice programmers.
["Introduction to PL/1 and PL/C programming", Kochenburger, Ralph J., Santa Barbara, Hamilton, c1974].
["User's Guide to PL/C", S. Worona et al, Cornell, June 1974].
["PL/C - A High Performance Compiler" H.L. Morgan et al, Proc SJCC, AFIPS 38:503-510 (1971)].