TY  - RPRT
TI  - Geologic structure of the Punxsutawney, Curwensville, Houtzdale, Barnesboro, and Patton quadrangles, central Pennsylvania
AU  - G. H. Ashley
AU  - M. R. Campbell
PY  - 1913
DO  - 10.3133/b531d
UR  - https://pubs.usgs.gov/publication/b531D
ID  - b531D
ER  -