Seminar on rationale of regional variations in agr 

 -  1956 
 - Seinar Series 1 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Industry
<br/><br/><label>Dewey Class. No.: </label>X9(J).2.N5, J6