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| 100 | _aAGUAYO ESCANDON, SERGIO ALBERTO | ||
| 245 | 0 | _aVISION PANORAMICA DE LA INVESTIGACION DE MINERALES EN EL AREA ESPOL-2AESPOL-2A | |
| 250 | _a1A ED. | ||
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_aEcuador _bESPOL _c1986 |
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| 260 | _aGUAYAQUIL | ||
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| 500 | _aD-7303 S/25 IGMP BIB 86.22.JUL. | ||
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