Helvig, Magne. <br/><br/>
Chicago's external truck movements :  spatial interactions between the Chicago area and its hinterland / 
by Magne Helvig. 
 - Chicago :  [Dept. of Geography, University of Chicago],  1964. 
 - x, 132 p. :  ill., maps (part fold.) ;  23 cm. 
 - University of Chicago. Dept. of Geography. Research paper  no. 90 .
 -  no. 90. Research paper (University of Chicago. Department of Geography) ; .
<br/><br/>Bibliography: p. 128-132. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trucking--United States.
<br/><br/><label>Dewey Class. No.: </label>388.324  / HEC 1964