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|a Ayala Guerrero, Luis Ernesto
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|a Diseño de sistema de alcantarillado de aguas negras de la ciudad de La Unión
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| 260 |
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|a San Salvador :
|b Universidad de El Salvador,
|c 1999
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| 300 |
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|a 280 h. ;
|b il.
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|a Tesis (Ing. Civil) -- Universidad de El Salvador
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| 700 |
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|a Umanzor Cruz, José David
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