TY  - BOOK
AU  - Ryan, John C.,
AU  - Elkin, Vicki,
AU  - Ayres, Ed,
ED  - Worldwatch Institute
TI  - Life support: Conserving biological diversity 
T2  - Worldwatch paper
SN  - 0878071092
AV  - QH84 R93
PY  - 1992///
CY  - Washington, D.C.
PB  - Worldwatch institute
KW  - Ecología
KW  - Biodiversidad
ER  -