| 000 | 00394cam a22001097a 4500 | ||
|---|---|---|---|
| 008 | 180718b1969 xxu||||| |||| 00| 0 eng d | ||
| 082 | _aT09x73 N213 /49 | ||
| 245 |
_aNew challenges for economic research _cby National Bureau of Economic Research, U.S.A. |
||
| 260 |
_aNew York _bNational Bureau of Economic Research _c1969 |
||
| 300 | _a146p. | ||
| 700 | _aU.S.A. National Bureau of Economic Research | ||
| 999 |
_c431518 _d431518 |
||