TY  - BOOK
AU  - Sagan,Dorion
TI  - Biospheres: metamorphosis of planet Earth 
SN  - 0140193154
AV  - QH313 .S24 1990
PY  - 1990///
CY  - New York
PB  - McGraw-Hill
KW  - Biosphere
N1  - Includes index; Bibliography: p.185-193
ER  -