Maynard, Massachusetts: Digital Equipment Corporation 1972. Third Edition. 8 x 5 1/4 inches. Variously paginated. Publisher's brown and white printed wrappers. The usual browning to the paper, and some creasing/dings to the page edges. Rear cover with denting from heavy books once stacked on top (at a guess). Very Good. Trade Paperback. 
An early guide to programming Digital Equipment Corporation PDP-8s. A second volume was done for programming languages.
From the foreword: "More than 400,000 copies of Introduction to Programming (Vol 1) have been printed since December 1968. We at Digital Equipment Corporation are now convinced more than ever beforeo that there is a definite need for a book that clearly explains machine language programming, assembly language programming, and programming systems....I wish to thank all the programmers, writers, teachers, and students who have controbuted to these handbooks, making compact, low-cost programming infromation about the PDP-8 series more accessible than ever - Kenneth H. Olsen, President, Digital Equipment Corporation"
This is the third edition, May 1972. The first edition was printed in January 1969, and the Second edition in September 1970.