As a preliminary step in the comprehensive study of the Puget-Willamette Lowland, a literature search was made and bibliographies compiled for each of the subareas. The purpose of this report is to provide a bibliography of selected references on the hydrology of the Puget Sound Lowland aquifer system. This bibliography emphasizes the groundwater resources and includes studies of the glacial geology, geochronology, geophysics, structural geology and tectonics, surface water, evapotranspiration, and other pertinent subjects. It also includes selected groundwater studies that were done in glaciated areas throughout the United States. CANADA 100 200 MILES 100 200 300 KILOMETERS Figure 1.-Location of the Puget Sound Lowland and the Willamette Valley, which make up the Puget-Willamette Lowland regional aquifer-system study area.