1935–1942
United States Geological Survey, 1937
United States Geological Survey, 1938
United States Geological Survey, 1892
United States Geological Survey, 1940
United States Geological Survey, 1936
United States Geological Survey, 1939
United States Geological Survey, 1935
United States Geological Survey, 1653
United States Geological Survey, 1910
United States Geological Survey, 1941
