The number combinations, their relative difficulty and the frequency of their appearance in text-books,
Wedi'i Gadw mewn:
| OCLC: | 4285002 |
|---|---|
| Prif Awdur: | |
| Awduron Eraill: | |
| Iaith: | English |
| Cyhoeddwyd: |
Madison, Wis.
[1924]
|
| Cyfres: | University of Wisconsin. Bureau of Educational Research. Bulletin no. 2. July 1924.
|
| Pynciau: | |
| Fformat: | Monograph Note that CRL will digitize material from the collection when copyright allows. |