TY  - BOOK
AU  - Sagan,Dorion
TI  - Biospheres: metamorphosis of planet earth 
SN  - 9780140193152
PY  - 1990///
CY  - New York, NY
PB  - Penguin Group
KW  - Biosphere
N1  - Includes index; Bibliography: p.185-193
ER  -