Billings, W. D.  <br/><br/>
Plants, man and the ecosystem 
W. D. Billings 
 - 2nd  ed. 
 - London  Macmillan  1972 
 - x,160p. : ill., tables., map.; 24cm.- 
 - Fundamentals of botany series;5 .
<br/><br/><label>Dewey Class. No.: </label>574.5  / BIL