P F <br/><br/>
Bomograph farm calculater 

 - Sydney  Power farming mager inc power farming technical annul  1964 
 - 16p 
<br/><br/><br/>ENGLISH 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AGRICULTURE
<br/><br/><label>Dewey Class. No.: </label>630.5  / P E