USGS Washington Water Science Center
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Sapik, D.B., 1988, Documentation of a steady-state saltwater-intrusion model for three - dimensional ground-water flow, and user's guide: U.S. Geological Survey Open-File Report 87-526, 174 p.
Sapik, D.B., Bortleson, G.C., Drost, B.W., Jones, M.A., and Prych, E.A., 1989, Ground-water resources and simulation of flow in aquifers containing freshwater and seawater, Island County, Washington: U.S. Geological Survey Water-Resources Investigations Report 87-4182, 4 sheets.
Sumioka, S.S., and Bauer, H.S., 2003, Estimating ground-water recharge from precipitation on Whidbey and Camano Islands, Island County, Washington, Water Years 1998 and 1999: U.S. Geological Survey Water-Resources Investigations Report 03-4101, 49 p.