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_aWilson, E. Bright, Jr. _9122184 |
| 245 | 1 | 3 | _aAn introduction to scientific research |
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_aNew York : _bMcGraw-Hill, _c1952 |
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_a373 p. _b: ilus. |
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_aDiseños experimentales. _932735 |
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_aInvestigación _xMetodología. _960237 |
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_aMcGraw-Hill paperbacks _973551 |
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