TY  - BOOK
ED  - The Conservation Foundation 
TI  - Concepts of Conservation: A Guide to Discussion of Some Fundamental Problems 
U1  - 333.72 23
PY  - 1963///
CY  - New York
PB  - The Conservation Foundation
KW  - Conservation
KW  - Conservación
KW  - Natural resources
KW  - Recursos naturales
ER  -