A bibliography containing about 550 references on the hydrogeology of the Willamette Valley was compiled as part of the Puget-Willamette Lowland Regional Aquifer System Analysis study. A separate bibliography was compiled for the Puget Lowland part of the study area. The report is organized into two parts: an authoralphabetized reference list, and a subject index with 81 topic and geographic keywords. Materials referenced include maps, reports, journal articles, theses, and dissertations.