TY  - RPRT
TI  - Water quality in the Appalachian Valley and Ridge, the Blue Ridge, and the Piedmont Physiographic Provinces, eastern United States
AU  - L. I. Briel
PY  - 1997
DO  - 10.3133/pp1422d
UR  - https://pubs.usgs.gov/publication/pp1422D
ID  - pp1422D
ER  -