Beckmann Martin, and others <br/><br/>
Studies in the economics of transportation 
Beckmann Martin, and others 
 - New Haven   Yale University Press         1955 
 - xi,232p  cm. 
<br/><br/> Bibliography: p 219-225 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>X4, J5/TD3