1. Nutrients and organic compounds in Deer Creek and South Branch Plum Creek in southwestern Pennsylvania, April 1996 through September 1998 Author/Creator: Williams, Donald R. (Hydrologist), author Publication/Creation: New Cumberland, Pennsylvania : U.S. Department of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
2. Effects of coal-mine discharges on the quality of the Stonycreek River and its tributaries, Somerset and Cambria counties, Pennsylvania Author/Creator: Williams, Donald R. (Hydrologist), author Publication/Creation: Lemoyne, Pennsylvania : U.S. Geological Survey, 1996 Resource Type: Book Access & Availability: Loading
3. Preimpoundment water quality of Raystown Branch Juniata River and six tributary streams, south-central Pennsylvania Author/Creator: Williams, Donald R. (Hydrologist), author Publication/Creation: Pittsburgh, Pa. : U.S. Geological Survey, 1976 Resource Type: Book Access & Availability: Loading