The first edition of the Unix Programmer's Manual, dated November 3, 1971, is available here in image, Postscript, and PDF format. Return with us to the golden days of yesteryear!
LISP 1.5 Programmer's Manual. J. McCarthy et al. 1962.
LISP I Programmer's Manual. J. McCarthy et al. 1960.
The Programming Language LISP: Its Operation and Applications. 1964.
This sites contains files on the history of computer programming language statements. The files compare programming language statements in several different languages tracing the statement from early languages to present languages.
Summary of classic the worse-is-better vs. the-right-thing discussion by Richard P. Gabriel.