Qayum, A. <br/><br/>
Cumulative marginal productivity, life o plants and the optional technology / 
A. Qayum 
 - Cairo :      INP ,  1964     
 - 19p. ;  32 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economic theory
<br/><br/><label>Dewey Class. No.: </label>330.1  / QAY