| 000 | 00314cam a22000977a 4500 | ||
|---|---|---|---|
| 008 | 180718b1962 xxu||||| |||| 00| 0 eng d | ||
| 082 | _aYA6084 Un3r | ||
| 245 | _aThe rate and direction of inventive activity: economic and social factors | ||
| 260 |
_aPrinceton _bPrinceton University Press _c1962 |
||
| 650 | _aInventions | ||
| 999 |
_c501663 _d501663 |
||