APA Citation

Estados Unidos. Geological Survey. (1946). Physical divisions of the United States. Washington: The Survey.

Chicago Style Citation

Estados Unidos. Geological Survey. Physical Divisions of the United States. Washington: The Survey, 1946.

MLA Citation

Estados Unidos. Geological Survey. Physical Divisions of the United States. Washington: The Survey, 1946.

Warning: These citations may not always be 100% accurate.