TY  - RPRT
TI  - GRA prospectus; optimizing protected areas for conservation, September 2001
AU  - David Halsing
AU  - Richard Bernknopf
PY  - 2002
DO  - 10.3133/ofr0267
UR  - https://pubs.usgs.gov/publication/ofr0267
ID  - ofr0267
ER  -