1. Plan of study for the Puget-Willamette Lowland regional aquifer system analysis, western Washington and western Oregon Author/Creator: Vaccaro, J. J., author Publication/Creation: Portland, Oregon : U.S. Geological Survey, 1992 Resource Type: Book Access & Availability: Loading
2. Geologic framework of the Columbia Plateau Aquifer System, Washington, Oregon, and Idaho Author/Creator: Drost, B. W., author Publication/Creation: Portland, Oregon : U.S. Geological Survey, 1990 Resource Type: Book Access & Availability: Loading