Image Missing: Hearst Museum object titled Black-and-white negative, accession number 15-11738, described as Black and white negative. McGillivray site (Sohneck 142) Mokelumne R. San Joaquin County, California. Heizer's Chevrolet. October 1937. 2 1/4 x 2 1/4 inches. 15-11738. R.F. Heizer.