San Francisco, Sierra Club, 1947, 33 pp, reprinted from the Sierra Club Bulletin, 1946. Pamphlet, Very Good.
This is a reprint of the original article which later (in 1956) was expanded into a 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.