TY  - RPRT
TI  - Map of land modified by man in part of the Mars 7 1/2-minute Quadrangle, Allegheny County and vicinity, Pennsylvania
AU  - J. S. Pomeroy
PY  - 1974
DO  - 10.3133/ofr74115
UR  - https://pubs.usgs.gov/publication/ofr74115
ID  - ofr74115
ER  -