Claim: Royal Robbins has published two books on rock climbing that outline his values, but neither was considered influential.
Evidence: Royal Robbins (February 3, 1935 – March 14, 2017) was one of the pioneers of American rock climbing. Robbins authored two seminal books, Basic Rockcraft and Advanced Rockcraft, which emphasized free climbing skills and a clean-climbing ethic. In a section of Advanced Rockcraft called Values, he described his climbing philosophy. As an early proponent of boltless, pitonless clean climbing, he, along with Yvon Chouinard, was instrumental in changing the climbing culture of the late 1960s and early 1970s by encouraging the use and preservation of the natural features of the rock.