TY  - RPRT
TI  - Ecoregions and ecoregionalization: geographical and ecological perspectives
AU  - Thomas R. Loveland
AU  - James W. Merchant
PY  - 2004
DO  - 10.1007/s00267-003-5181-x
UR  - https://pubs.usgs.gov/publication/70157051
ID  - 70157051
ER  -