TY  - RPRT
TI  - Geologic map of the Ashland quadrangle, Columbia and Schuylkill Counties, Pennsylvania
AU  - Harold H. Arndt
PY  - 1971
DO  - 10.3133/gq918
UR  - https://pubs.usgs.gov/publication/gq918
ID  - gq918
ER  -