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| 041 | _aEnglish | ||
| 082 | _aGN510 B832D C2 | ||
| 100 | _aLEO J BRUECKNER | ||
| 245 | 0 | _aDEVELOPING MATHEMATICAL UNDERSTANDINGS | |
| 260 |
_aPHILADELPHIA _bTHE JOHN C. WINSTON COMPANY _c1957 |
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| 653 | _aDEVELOPING MATHEMATICAL UNDERSTANDINGS | ||
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