TY  - RPRT
TI  - Map of land modified by man in part of the Valencia 7 1/2-minute Quadrangle, Allegheny County and vicinity, Pennsylvania
AU  - John S. Pomeroy
PY  - 1974
DO  - 10.3133/ofr74117
UR  - https://pubs.usgs.gov/publication/ofr74117
ID  - ofr74117
ER  -