TY  - RPRT
TI  - Atlas of urban and regional change, greater Pittsburgh region, Pennsylvania; B, Census Tracts, 1970
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1976
DO  - 10.3133/ofr7528b
UR  - https://pubs.usgs.gov/publication/ofr7528B
ID  - ofr7528B
ER  -