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| Autor: | Shea, Thomas O', Whitin, David J. |
|---|---|
| Zdroj: | Arithmetic Teacher. Sep93, Vol. 41 Issue 1, p45. 1/2p. |
| Databáze: | Academic Search Ultimate |
| Externí odkaz: |
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| Autor: | Shea, Thomas O', Whitin, David J. |
|---|---|
| Zdroj: | Arithmetic Teacher. Sep93, Vol. 41 Issue 1, p45. 1/2p. |
| Databáze: | Academic Search Ultimate |
| Externí odkaz: |
|