The returns to skill in the United States across the twentieth century
| 1. autor: | |
|---|---|
| Kolejni autorzy: | |
| Format: | Książka |
| Język: | English |
| Wydane: |
Cambridge, Mass.
National Bureau of Economic Research
1999.
|
| Seria: | NBER working paper series
no.7126 |
| Hasła przedmiotowe: |