1. Estimated average annual ground-water pumpage in the Portland Basin, Oregon and Washington 1987-88 Author/Creator: Collins, C. A. 1944- (Charles Alexander), author Publication/Creation: Portland, Oregon : U.S. Geological Survey, 1994 Resource Type: Book Access & Availability: Loading
2. Estimation of ground-water recharge from precipitation, runoff into drywells, and on-site waste-disposal systems in the Portland basin, Oregon and Washington Author/Creator: Snyder, Daniel T., author Publication/Creation: Portland, Oregon : U.S. Geological Survey, 1994 Resource Type: Book Access & Availability: Loading