Close Ups of the High Sierra by Norman Clyde
La Siesta Press was founded nearby me in Glendale, California in 1960, and that's pretty much all I know, even after plenty of googling. The now-defunct publishing company had me at their name, but their books, which are all paperbacks of the same trim size, do not disappoint, either. I'm in the process of collecting most of them, especially the ones with titles like Mines of Death Valley, Grand Canyon Jeep Trails, and Climbing Mount Whitney. If you haven't guessed already, most of their titles focus on the outdoors in the Western United States.
My favorite so far is Close Ups of the High Sierra by Norman Clyde, published in 1976. Clyde, who apparently died four years before the book was published, was a high school principal based in Independence, California. After some strange incident involving a gun at school, Clyde resigned from his position and dedicated the rest of his life to the Sierra Nevada through mountaineering, hiking, writing, and photography. This book is an illustrated outline of his greatest adventures on the highest peaks.