Trzeciakowski, Witold  <br/><br/>
Methods for the determination of the marginal rate and simplified methods for analysis of the effectiveness of foreign trade / 
Witold Trzeciakowski 
 - Warszawa :  Foreign Trade Research Centre ,  1964 
 - 94p. :  ill. ;   21 cm.  
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Commerce--Poland 
<br/><br/><label>Gov. Doc. Class. No.: </label>PI FTRC Met