Economy and technique of learning,
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| OCLC: | 2142688 |
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| 主要作者: | |
| 语言: | English |
| 出版: |
Boston,
D. C. Heath
[c1932]
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| 主题: | |
| 格式: | Monograph Note that CRL will digitize material from the collection when copyright allows. |
| 实物描述: | x, 534 p. illus., diagrs. 20 cm. |
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