TY  - RPRT
TI  - Ecoregions and subregions of the United States
AU  - Robert G. Bailey
AU  - Peter Avers
AU  - Thomas King
AU  - W. Henry McNab
PY  - 1994
DO  - 10.3133/70250183
UR  - https://pubs.usgs.gov/publication/70250183
ID  - 70250183
ER  -