Diagnosis of individual difficulties in arithmetic /
Wedi'i Gadw mewn:
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
Edinburgh :
Oliver and Boyd,
1942.
|
| Rhifyn: | 2nd ed. (rev.) |
| Pynciau: |
| Disgrifiad Corfforoll: | xi, 115 p. : ill. ; 19 cm. |
|---|