Perle, Eugene D. <br/><br/>
The demand for transportation:  regional and commodity studies in the United States / 
by Eugene D. Perle. 
 - Chicago :  Dept. of Geography, University of Chicago,  1964. 
 - xx, 130 p. :  maps. ;  23 cm. 
 - University of Chicago. Dept. of Geography. Research paper no. 95 .
 -  no. 95. Research paper (University of Chicago. Department of Geography) ; .
<br/><br/>Bibliography: p. 127-130. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freight and freightage--Mathematical models.--United States
<br/><br/><label>Dewey Class. No.: </label>385  / PED 1964