USGS Washington Water Science Center
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Orr, L.A., Bauer, H.H, and Wayenberg, W.A., 2002, Estimates of ground - water recharge from precipitation to glacial-deposit and bedrock aquifers on Lopez, San Juan, Orcas, and Shaw Islands, San Juan County, Washington: U.S. Geological Survey Water-Resources Investigations Report 02-4114, 122 p.
Orr, Laura, 2000, Is seawater intrusion affecting ground water on Lopez Island, Washington?: U.S. Geological Survey Fact Sheet FS-057-00, 8 p.
Washburn, R.L., 1954, Preliminary investigation of ground water in the East Sound area, Orcas Island, San Juan County, Washington: U.S. Geological Survey Water-Resources Investigations Open-File Report 54-328, 26 p.
Whiteman, K.J., Molenaar, Dee, Bortleson, G.C., and Jacoby, J.M., 1983, Occurrence, quality, and use of ground water in Orcas, San Juan, Lopez, and Shaw Islands, San Juan County, Washington: U.S. Geological Survey Water-Resources Investigations Report 83-4019, 12 sheets.