Improving the learning environment a study on the local preparation of visual instruction materials
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| 格式: | 圖書 |
| 語言: | English |
| 出版: |
[Washington]
U.S. Dept. of Health, Education, and Welfare, Office of Education
[1963].
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| 叢編: | U.S. Office of Education. Circular no. 718
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