TY  - BOOK
AU  - Perry, David A.
TI  - Maintaining the long-term productivity of pacific north west forest ecosystems
U1  - 634.909795 
PY  - 1989///
CY  - Portland, Oregon
PB  - Timber Press
KW  - Bosques
KW  - Oregon
KW  - Ecología forestal
KW  - Ecosistema
N1  - 63-77
ER  -