Hermanson, Roger R <br/><br/>
Programmed learning aid for introduction to data progressing 
edited by C. Orville Elliot 
 - 3rd. ed 
 - Homewood, ILL  Learning System Company  [1979] 
 - xiii, 151p. : ill. 
<br/><br/><label>LC Class. No.: </label>HF 5548.2 Ell