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| 100 |
_6Valkenburgh, Van _f1970 eje 4 _lspa _tElectricidad Básica |
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| 245 | _aElectricidad Basica | ||
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_aMéxico _bValkenburgh, Van; Compañia Editorial Continental _c1970 |
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| 942 | _2ddc | ||
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