The number combinations, their relative difficulty and the frequency of their appearance in text-books,
Guardat en:
| OCLC: | 4285002 |
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| Autor principal: | |
| Altres autors: | |
| Idioma: | English |
| Publicat: |
Madison, Wis.
[1924]
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| Col·lecció: | University of Wisconsin. Bureau of Educational Research. Bulletin no. 2. July 1924.
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| Matèries: | |
| Format: | Monograph Note that CRL will digitize material from the collection when copyright allows. |