Visual aids : their construction and use /
| Main Author: | |
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| Other Authors: | |
| Format: | Book |
| Language: | English |
| Published: |
New York :
D. Van Nostrand Co.,
[1949]
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| Subjects: |
| Physical Description: | 388 pages : illustrations ; 24 cm. |
|---|---|
| Bibliography: | Includes "references." |