25 juin 2019
H.A. Jensen, « Chaparral type of Quercus durata and Umbellularia californica (scrub form) on deep soil are of serpentine formation. Associated species: Pinus sabiniana, Arctostaphylos viscida. Single Ponderosa pine growing on area gives site index of 100. On Georgetown Road, half mile N. of Hotchkiss Hill. », Berkeley Library Digital Collections, ID : 10670/1.195imu