APA (7th ed.) Citation

Hansen, R. E. (1973). Bedrock topography of southeast Iowa. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Hansen, Robert E. Bedrock Topography of Southeast Iowa. Washington, D.C.: U.S. Geological Survey, 1973.

MLA (9th ed.) Citation

Hansen, Robert E. Bedrock Topography of Southeast Iowa. U.S. Geological Survey, 1973.

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