TY - RPRT TI - Mineral resource potential map of the Clarion River Roadless Area, Elk County, Pennsylvania AU - S. P. Schweinfurth AU - Wallace De Witt AU - R. A. Welsh AU - P. T. Behum PY - 1983 DO - 10.3133/mf1444b UR - https://pubs.usgs.gov/publication/mf1444B ID - mf1444B ER -