25 juin 2019
H.R. Josephson, « Ponderosa pine, Douglas fir, black oak type in Campbell Creek, with chaparral Arctostaphylos viscida, Quercus garryana breweri, Quercus kelloggii, Ceanothus cuneatus on S slope. 1.5 miles S of delta. Redding Quadrangle. », Berkeley Library Digital Collections, ID : 10670/1.730r4m