TY  - BOOK
AU  - Polunin, Nicholas (Ed.)
TI  - Front cover image for Maintenance of the biosphere : proceedings of the Third International Conference on Environmental Future (3rd ICEF) Maintenance of the biosphere : 
SN  -  0748601422
PY  - 1990///
CY  - Edinburgh: 
PB  - Edinburgh University Press, 
KW  - Science
ER  -