Soil map, California, reconnoissance survey. San Francisco Bay sheet - United States. Bureau of Soils; Lapham, Macy H. (Macy Harvey), b. 1874; Holmes, L. C.; Nelson, J. W. (James Warren); California Agricultural Experiment Station (Bureau of Soils, 1914)
"Macy H. Lapham, Inspector, Western Region. Soils surveyd by L.C. Holmes, of the U.S. Department of Agriculture, in charge, and J.W. Nelson, of the University of California."