Helgesen, J. O., Heck, B. A., & Hargadine, D. A. (1993). Hydrogeology and ground-water-quality conditions at the Harvey County Landfill, south-central Kansas, 1990. U.S. Geological Survey.
Chicago Style (17th ed.) CitationHelgesen, John O., Brian A. Heck, and Dirk A. Hargadine. Hydrogeology and Ground-water-quality Conditions at the Harvey County Landfill, South-central Kansas, 1990. Lawrence, Kansas: U.S. Geological Survey, 1993.
MLA (9th ed.) CitationHelgesen, John O., et al. Hydrogeology and Ground-water-quality Conditions at the Harvey County Landfill, South-central Kansas, 1990. U.S. Geological Survey, 1993.
Warning: These citations may not always be 100% accurate.