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|c 93098
|d 93098
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|9 228606
|a Hyman, Herbert
|d 1918-1985
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| 245 |
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|a Relaciones causales :
|b el modelo del experimento y el control de las variables /
|c H. Hyman.
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| 260 |
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|a [Buenos Aires :
|b Universidad de Buenos Aires. Facultad de Filosofía y Letras ,
|c ca. 1970].
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| 300 |
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|a 9 p.
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| 500 |
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|a En Survey design and analysis. Glencoe, Illinois: Free Press, 1955, pp. 242-254.
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| 650 |
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0 |
|9 33371
|a Ciencia
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| 942 |
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|2 z
|c FDC
|