TY  - RPRT
TI  - Geologic map of the Swatara Hill quadrangle, Schuylkill and Berks Counties, Pennsylvania
AU  - Gordon H. Wood
AU  - Thomas M. Kehn
PY  - 1968
DO  - 10.3133/gq689
UR  - https://pubs.usgs.gov/publication/gq689
ID  - gq689
ER  -