APA (7th ed.) Citation

Lucassen, J. A. (2003). Soil survey of Keokuk County, Iowa. Natural Resources Conservation Service.

Chicago Style (17th ed.) Citation

Lucassen, John A. Soil Survey of Keokuk County, Iowa. [Washington, D.C.]: Natural Resources Conservation Service, 2003.

MLA (9th ed.) Citation

Lucassen, John A. Soil Survey of Keokuk County, Iowa. Natural Resources Conservation Service, 2003.

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