Sagan, Dorion,  1959- <br/><br/>
Biospheres :  metamorphosis of planet Earth / 
by Dorion Sagan. 
 - New York :  McGraw-Hill,  c1990. 
 - vii, 198 p. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p.185-193. 
<br/><br/><label>ISBN: </label>0140193154 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biosphere.
<br/><br/><label>LC Class. No.: </label>QH313  / .S24 1990