The number combinations, their relative difficulty and the frequency of their appearance in text-books,
Salvato in:
| OCLC: | 4285002 |
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| Autore principale: | |
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| Lingua: | English |
| Pubblicazione: |
Madison, Wis.
[1924]
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| Serie: | University of Wisconsin. Bureau of Educational Research. Bulletin no. 2. July 1924.
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| Soggetti: | |
| Natura: | Monograph Note that CRL will digitize material from the collection when copyright allows. |