Foster, Phillips W. <br/><br/>
Programmed learning aid for introduction to environmental science 
Phillips W. Foster; coordinating editor by, Roger H. Hermanson. 
 - Illinois  Learning Systems a Division of Richard D'Irwin  1972 
 - xi, 181p  ill  25cm. 
<br/><br/><label>Dewey Class. No.: </label>375.0083  / F71P