Ashworth William <br/><br/>
Encyclopaedia of environmental  studies 

 - New York  Facts on file     1991 
 - 470p  cm. 
<br/><br/><label>Standard No.: </label>20816 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Subjects--Topical Terms: </label><br/> BIOLOGY<br/>ENVIRONMENTAL SCIENCE
<br/><br/><label>Dewey Class. No.: </label>G:55k, N1(RR)