Yosemite Climbs by George Myers (1976)
Yosemite Climbs by George Myers and published by Mountain Letters, (Modesto, CA). We think it was printed in 1976 and was possibly a first (or very early) edition. Interestingly it is produced as a very large US letter sized (A4ish here in Oz) guide which was ring bound. This was to allow climbers to remove a particular page and take it along with them on the route. Yosemite Climbs covered 350 routes and was regarded as an iconic guide of the 1970s.