Snuffer

1935–1942

Related works

United States Geological Survey, 1937

United States Geological Survey, 1936

United States Geological Survey, 1936

United States Geological Survey, 1937

United States Geological Survey, 1936

United States Geological Survey, 1936

United States Geological Survey, 1939

United States Geological Survey, 1937

United States Geological Survey, 1936

United States Geological Survey, 1939

United States Geological Survey, 1939

United States Geological Survey, 1937