APA (7th ed.) Citation

Chen, A. H. (1996). Distribution of selected nitrogen compounds in ground water and the unsaturated zone, Superior-Hardy Special Protection Area, Nuckolls County, Nebraska, 1991-93. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Chen, Abraham H. Distribution of Selected Nitrogen Compounds in Ground Water and the Unsaturated Zone, Superior-Hardy Special Protection Area, Nuckolls County, Nebraska, 1991-93. Lincoln, Nebraska: U.S. Department of the Interior, U.S. Geological Survey, 1996.

MLA (9th ed.) Citation

Chen, Abraham H. Distribution of Selected Nitrogen Compounds in Ground Water and the Unsaturated Zone, Superior-Hardy Special Protection Area, Nuckolls County, Nebraska, 1991-93. U.S. Department of the Interior, U.S. Geological Survey, 1996.