TY  - RPRT
TI  - A preliminary report on the stratigraphy of previously unreported Devonian ashfall localities in the Appalachian Basin
AU  - John B. Roen
PY  - 1980
DO  - 10.3133/ofr80505
UR  - https://pubs.usgs.gov/publication/ofr80505
ID  - ofr80505
ER  -