7 juillet 2023
Albert Everett Wieslander, « Grass-hardwood type, very open density of hardwoods, pure old-growth, species Quercus lobata and Quercus douglasii, Bromus hordeaceus, Avena barbata. Assoc. spp.: Hypericum perforatum. (Air photo 94-12). Yuba County. », Berkeley Library Digital Collections, ID : 10670/1.hd2pbh