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Ground-water levels in the United States, 1967-71, north-central States
Water Resources Division, U.S. Geological Survey
1973, Water Supply Paper 2090
Publication of ground-water level data for the United States in watersupply papers was begun by the Geological Survey in 1935. From 1935 through 1939, a single water-supply paper for each year covering the entire Nation was issued (Water-Supply Papers 777, 817, 840, 845, and 886). Since then water-supply papers have...