Image Missing: Hearst Museum object titled Black-and-white negative, accession number 15-12167, described as Black and white negative. Site J 89 = 131, Madera County. Close view showing mortars under water of San Joaquin River. July 18, 1939. 2 3/8 square inches. 15-12167. Collector: Gordon W. Hewes. Donor: U.C. Central San Joaquin Valley Survey. Original number: 134.