| 000 | 00492nam a22001577a 4500 | ||
|---|---|---|---|
| 008 | 230310b |||||||| |||| 00| 0 eng d | ||
| 040 |
_aNational Science Library _cNational Science Library |
||
| 080 | _aD 025.49LC | ||
| 245 |
_aLibrary congress classification: _bClass l. education _c/Library of congress |
||
| 250 | _a3rd ed. | ||
| 260 |
_aWashington: _bThe library of congress, _c1951 |
||
| 300 | _a243p. | ||
| 650 | _aClassification | ||
| 653 | _aLibrary of congress | ||
| 942 |
_2udc _cREF |
||
| 999 |
_c7661 _d7661 |
||