TY  - RPRT
TI  - Ecoregions as a level of ecological analysis
AU  - R.G. Wright
AU  - M.P. Murray
AU  - T. Merrill
PY  - 1998
DO  - 10.1016/s0006-3207(98)00002-0
UR  - https://pubs.usgs.gov/publication/70020532
ID  - 70020532
ER  -