San Francisco, Sierra Club, 1956 (1st ed) 1959, 2nd, 1962 4th or 1965, 7th printing. 85 pp, b/w illustrations. Softcover. Very Good to Near Fine.
Influential technique pamphlet that went through many printings. One of the seminal works on rock climbing, particularly as it was developed in America in the 1930s through the 1950s. Detailed description of technique, particularly the belay.