TY  - BOOK
AU  - Olsen,Erling
TI  - International trade theory and regional income differences: United States 1880-1950 
SN  - 0720431700
PY  - 1971///
CY  - Amsterdam
PB  - North-Holland Publishing Company
KW  - Income
KW  - Mathematical models
KW  - United States
KW  - International trade
N1  - Summary in Dutch
ER  -