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| 082 |
_a510 _bINS _223 |
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| 245 | _aINSTRUCTIONAL aids in mathematics thirth-Fourth yearbook | ||
| 260 |
_aWashington _bNational council of Teachers of Mathematics _c1973 |
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| 300 | _axvi, 442 p. | ||
| 500 | _aIncludes bibliography & appendix. | ||
| 509 | _aNS | ||
| 650 | _aMathematics | ||
| 942 | _cS | ||