1937
United States Geological Survey, 1937
United States Geological Survey, 1936
United States Geological Survey, 1940
United States Geological Survey, 1939
United States Geological Survey, 1935
United States Geological Survey, 1932
![The Official George Washington Bicentennial Commemorative Medal [reverse]](https://api.nga.gov/iiif/6e3f8634-8ed8-48b0-8492-df10598a2c11/full/843,/0/default.jpg)
