TY  - RPRT
TI  - Preliminary map showing the distribution and thickness of sandstone in the lower member of the Pittsburgh Formation, southwestern Pennsylvania and northern West Virginia
AU  - J.B. Roen
AU  - D.F. Kreimeyer
PY  - 1973
DO  - 10.3133/mf529
UR  - https://pubs.usgs.gov/publication/mf529
ID  - mf529
ER  -