Farm management investigations for agricultural improvement / 
Preparated by W. Y. Yang. 
 -- Rome :   Food and Agriculture Organization of the United Nations,   1952 
 - v, 36 p. -- 
 (FAO Development paper  ; 20).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura
<br/><br/><label>Universal Decimal Class. No.: </label>631.1