TY  - BOOK
AU  - Olsen, Erling
TI  - International trade theory and regional income differences: United States 1880-1950 
T2  - Contributions to economic analysis
SN  - 0720431700
U1  - 382.1 
PY  - 1971///
CY  - Amsterdan
PB  - North Holand
KW  - Income, Mathematical models
KW  - Income, United States, mathematical models
KW  - International trade mathematical models
ER  -