Asimov, Isaac,  1920-1992 <br/><br/>
The wellsprings of life / 
Isaac Asimov 
 - London :  Abelard-Schuman,  1960 
 - 238 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label> PND 1.25 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecological heterogeneity<br/>Life (Biology)<br/>Evolution (Biology)
<br/><br/><label>Dewey Class. No.: </label>577