Books by Walter W. Bradley
California mineral production for 1926
California mineral production for 1925
California mineral production for 1924
California mineral production for 1920, with county maps
California mineral production for 1919, with county maps
California mineral production for 1918
California mineral production for 1917, with county maps
California mineral production for 1916, with county maps
Mines and mineral resources of the counties of Colusa, Glenn, Lake, Marin, Napa, Solano, Sonoma, Yolo
Mines and mineral resources of the counties of Fresno, Kern, Kings, Madera, Mariposa, Merced, San Joaquin, Stanislaus