Mansfield, Wendell C. (Wendell Clay), 1874-1939, author.
[Washington] : [United States Department of the Interior, United States Geological Survey], [1937]
1936
Mansfield, Wendell C. (Wendell Clay), 1874-1939, author.
[Washington] : [United States Department of the Interior, United States Geological Survey], [1937]
1936