TY - RPRT TI - A description of hydrogeologic units in the Portland Basin, Oregon and Washington AU - R.D. Swanson AU - W. D. McFarland AU - J. B. Gonthier AU - J.M. Wilkinson PY - 1993 DO - 10.3133/wri904196 UR - https://pubs.usgs.gov/publication/wri904196 ID - wri904196 ER -