Hydrology of the Great Plains Aquifer system in Nebraska, Colorado, Kansas, and adjacent areas / by John O. Helgesen, Robert B. Leonard, and Ronald J. Wolf
(Regional aquifer-system analysis--Central Midwest) (U.S. Geological Survey professional paper ; 1414-E)
"U.S. Department of the Interior, U.S. Geological Survey"--T.p. versoShipping list no.: 94-0080-PPhysical description for original version: viii, 80 p...