TY  - RPRT
TI  - Isopach Map and Regional Correlations of the Fire Clay Tonstein, Central Appalachian Basin
AU  - William F. Outerbridge
PY  - 2003
DO  - 10.3133/ofr03351
UR  - https://pubs.usgs.gov/publication/ofr03351
ID  - ofr03351
ER  -