Classification - Martel, Charles, 1860-1945; Bay, J. Christian (Jens Christian), 1871-1962; Johnston, William Dawson, 1871-1928; Schmidt, A. F. W. (Alfred Francis William), 1873-1966; Wolcott, J. D. (John Dorsey), 1871-1945 (Government Printing Office, 1911)