TY  - RPRT
TI  - Geologic map of the Hamburg quadrangle, Schuylkill and Berks Counties, Pennsylvania
AU  - Gary George Lash
PY  - 1987
DO  - 10.3133/gq1637
UR  - https://pubs.usgs.gov/publication/gq1637
ID  - gq1637
ER  -