25 juin 2019
Albert Everett Wieslander, « Snowden Hill Ridge. Group of old-growth trees. Species: Pinus ponderosa, Pseudotsuga taxifolia, Abies concolor, Douglas fir = 57" d.b.h. Ground cover : Chamaebatia foliolosa. (Air photo 3-35) », Berkeley Library Digital Collections, ID : 10670/1.tn24uy