TY  - RPRT
TI  - Geographic information system analysis of topographic change in Philadelphia, Pennsylvania, during the last century
AU  - P. G. Chirico
AU  - J. B. Epstein
PY  - 2000
DO  - 10.3133/ofr00224
UR  - https://pubs.usgs.gov/publication/ofr00224
ID  - ofr00224
ER  -