The Online Books Page

Books by Gary W. Levings:

Books in the extended shelves:

• Levings, Gary W.: Preliminary appraisal of ground water in and near the ancestral Missouri River valley, northeastern Montana (U.S. Dept. of the Interior, Geological Survey ;, 1986), also by Geological Survey (U.S.) (page images at HathiTrust)
• Levings, Gary W.: San Juan structural basin regional aquifer-system analysis (U.S. Dept. of the Interior, U.S. Geological Survey :, 1996), also by Condé R. Thorn, John Michael Kernodle, and Geological Survey (U.S.) (page images at HathiTrust)
• Levings, Gary W.: Water quality in the Rio Grande Valley, Colorado, New Mexico, and Texas, 1992-95 (U.S. Geological Survey, Water Resources Division ;, 1998), also by Geological Survey (U.S.) and National Water-Quality Assessment Program (U.S.) (page images at HathiTrust)

Find more by Gary W. Levings at your library, or elsewhere.