Cuffney, T.F., Gurtz, M.E., and Meador, M.R., 1993, Methods for collecting benthic invertebrate samples as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 93-406, p. 8, 16, 20-22.

Gilliom, R.J., Alley, W.M., Gurtz, M.E., 1995, Design of the National Water-Quality Assessment Program -- Occurrence and distribution of water-quality conditions: U.S. Geological Survey Circular 1112, p. V-VI, 9-12, 14-21, 26-29.

Herb, W.J., Brown, D.E., Shaw, L.C., Stoner, J.D., and Felbinger, J.K., 1983, Hydrology of area 2, eastern coal province, Pennsylvania and New York: U.S. Geological Survey Open-File Report 82-647, p. 1, 12-13, 80-81.

Herb, W.J., Shaw, L.C., Brown, D.E., 1981, Hydrology of area 3, eastern coal province, Pennsylvania: U.S. Geological Survey Water-Resources Investigations Open-File Report 81-537, 87 p.

Herb, W.J., Shaw, L.C., Brown, D.E., 1981, Hydrology of area 5, eastern coal province, Pennsylvania, Maryland, and West Virginia: U.S. Geological Survey Water-Resources Open-File Report Investigations 81-538, 91 p.

Krabbenhoft, D.P., Wiener, J.G., Brumbaugh, W.G., Olson M.L., DeWild J.F., and Sabin, T.J., 1999, A national pilot study of mercury contamination of aquatic ecosystems along multiple gradients, in Geological Survey Toxic Substances Hydrology Program, Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999, Volume 2, Contamination of Hydrologic Systems and Related Ecosystems: U.S Geological Survey Water-Resources Investigations Report 99-4018B, 16 p.

McAuley, S.D., 1995, National Water-Quality Assessment Program -- The Allegheny-Monongahela River Basin: U.S. Geological Survey Fact Sheet 137-95, p. (1-2).

McAuley, S.D., Brown, J.B., and Sams, J.I., III., 1997, National Water-Quality Assessment Program, Allegheny-Monongahela River Basin: U.S. Geological Survey Open-File Report 97-246, 6 p.

Pennsylvania Coal Association, 1997, Pennsylvania coal data 1997 report: Harrisburg, Pa., Pennsylvania Coal Association, p. 4-9.

Piper, A.M., 1933, Ground water in southwestern Pennsylvania: Commonwealth of Pennsylvania, Department of Internal Affairs, Topographic and Geologic Survey Water Resources Report 1, p. 6, 31.

Soller, D.R., and Packard, P.H., 1998, Digital representation of a map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains: U.S. Geological Survey Digital Data Series DDS-38, one CD-ROM.

Tully, J., 1996, Coal fields of the conterminous United States: U.S. Geological Survey Open-File Report 96-02, scale 1:5,000,000.

U.S. Geological Survey, [unpub. data], 1992 Land-cover information from Landsat Thematic Mapper (TM) data: U.S. Geological Survey, National Mapping Division, resolution 30 m2.

U.S. Geological Survey, 1985, National Water Summary 1984, Hydrologic events, selected water-quality trends, and ground-water resources: U.S. Geological Survey Water-Supply Paper 2275, p. 361.


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