Teaching by machine /
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| Main Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
Washington :
U. S. Department of Health,
1961.
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| Series: | Cooperative Research monograph ;
no. 6 |
| Subjects: |
| Physical Description: | 173 p. : ill. ; 23 cm. |
|---|---|
| Bibliography: | Bibliographical references. |