Physical, chemical, and biological data for selected streams in Chester County, Pennsylvania, 1981-94 [microform] / by Andrew G. Reif ; prepared in cooperation with the Chester County Water Resources Authority (Open-file report ; 99-216)
Physical, chemical, and biological data for selected streams in Chester County, Pennsylvania, 1981-94 [microform] / by Andrew G. Reif ; prepared in cooperation with the Chester County Water Resources Authority