TY  - RPRT
TI  - The structure and stratigraphy of the Pen Argyl Member of the Martinsburg Formation in Lehigh and Berks counties, Pennsylvania
AU  - Gary George Lash
PY  - 1978
DO  - 10.3133/ofr78391
UR  - https://pubs.usgs.gov/publication/ofr78391
ID  - ofr78391
ER  -