TY  - BOOK
AU  - Helvig,Magne
TI  - Chicago's external truck movements: spatial interactions between the Chicago area and its hinterland 
T2  - University of Chicago. Dept. of Geography. Research paper
U1  -  388.324 19
PY  - 1964///
CY  - Chicago
PB  - [Dept. of Geography, University of Chicago]
KW  - Trucking
KW  - United States
N1  - Bibliography: p. 128-132
ER  -