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Map showing ground-water level changes spring 1988 to spring 1989, by aquifer in the Portland Basin, Oregon and Washington
Ground-water level changes spring 1988-89
Intergovernmental Resource Center (Wash.)
Sand and gravel aquifer -- Troutdale gravel aquifer -- Troutdale sandstone aquifer -- Unconsolidated sedimentary aquifer.
by William D. McFarland ; prepared in cooperation with the City of Portland Bureau of Water Works, Intergovernmental Resource Center, and Oregon Water Resources Department.
"Base modified from U.S. Geological Survey"
Issued as one of seven folded maps in pocket: Description of the ground-water flow system in the Portland Basin, Oregon and Washington / by William D. McFarland and David S. Morgan.
Description of the ground-water flow system in the Portland Basin, Oregon and Washington
U.S. Geological Survey water-supply paper ; 2470-A, plate 7