Chairman Mao's theory of the differentiation of the three world's is a major contribution to Marxism-Leninism . 

 - Peking :      Foreign Languages Press ,  1977     
 - 79p. ;  12 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economic systems--China<br/>communism
<br/><br/><label>Dewey Class. No.: </label>335  / EHA