APA (7th ed.) Citation

(1978). Bedrock topography of North-Central Iowa. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Bedrock Topography of North-Central Iowa. Reston, Va: U.S. Geological Survey, 1978.

MLA (9th ed.) Citation

Bedrock Topography of North-Central Iowa. U.S. Geological Survey, 1978.

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