Penny, David Harry. <br/><br/>
The role of efficiency research in the improvement of estate management 
by D.H. Penny and S.B. Simandjuntak. 
 - [Medan?  1962?] 
 - 16 p.  33 cm. 
<br/><br/> At head of title: Planters Conference, 1962.  Cover. 
<br/><br/><label>LCCN: </label>sa 68019457  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Farm management.<br/>Agriculture--Economic aspects--Research.
<br/><br/><label>LC Class. No.: </label>S561  / .P38