APA (7th ed.) Citation

Gronberg, J. M., & Arnold, T. L. (2017). County-level estimates of nitrogen and phosphorus from animal manure for the conterminous United States: 2007 and 2012. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Gronberg, JoAnn M., and Terri L. Arnold. County-level Estimates of Nitrogen and Phosphorus from Animal Manure for the Conterminous United States: 2007 and 2012. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2017.

MLA (9th ed.) Citation

Gronberg, JoAnn M., and Terri L. Arnold. County-level Estimates of Nitrogen and Phosphorus from Animal Manure for the Conterminous United States: 2007 and 2012. U.S. Department of the Interior, U.S. Geological Survey, 2017.