Pin by Vincent Burzy, United States Geological Survey

1935–1942

Related works

United States Geological Survey, 1940

United States Geological Survey, 1935

United States Geological Survey, 1936

United States Geological Survey, 1935

United States Geological Survey, 1936

United States Geological Survey, 1610

United States Geological Survey

United States Geological Survey, 1936

United States Geological Survey, 1938

United States Geological Survey, 1936

United States Geological Survey, 1936

United States Geological Survey, 1938