A modular three-dimensional finite-difference ground-water flow model: Michael G. McDonald and Arlen W. Harbaugh. U.S. Geological Survey, National Center, Reston, Va., 1984, 528 pp. Copies available from Scientific Publications Co., P.O. Box 23041, Washington, DC 20026-3041. Price report $39,/computer program tape $35 (paperback)

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