TY  - BOOK
TI  - Ecological regions of North American: toward a common perspective
U1  - 577.097 
PY  - 1997///
CY  - Montreal
PB  - Commission for Environmental Cooperation
KW  - Zonificación ecológica
KW  - Ecorregiones
KW  - Regiones naturales
KW  - Diversidad de ecosistemas
ER  -