Ebbert, J.C., Embrey, S.S., Black, R.W., Tesoriero, A.J., and Haggland A.L., 2000, Water Quality in the Puget Sound Basin, Washington and British Columbia, 199698: U.S. Geological Survey Circular 1216, 31 p., on-line at https://pubs.water.usgs.gov/circ1216/