TY  - BOOK
AU  - Helvig Magne
TI  - Chicago's external truck movements :  Spatial interactions between the Chicago area and its Hinterland
T2  - University of Chicago Department of geography research paper; 90
U1  - X413.7376CH, K4 
PY  - 1964///
CY  - NA
PB  - NA       
KW  - ECONOMICS
ER  -