TY  - RPRT
TI  - Map of land modified by man in the Emsworth 7 1/2-minute Quadrangle, Allegheny County, Pennsylvania
AU  - J. S. Pomeroy
PY  - 1974
DO  - 10.3133/ofr7473
UR  - https://pubs.usgs.gov/publication/ofr7473
ID  - ofr7473
ER  -