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|a spa
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|a Johnson, Gilberto Ray
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| 245 |
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|a Demanda de agua en El Salvador;
|b investigación de demanda de agua en San Juan Opico /
|c Gilberto Ray Johnson ... [et al.].
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| 260 |
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|a San Salvador :
|b Universidad de El Salvador,
|c 1972
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| 300 |
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|a 53 h. ;
|b il
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| 502 |
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|a Tesis (Ing. Civil) -- Universidad de El Salvador
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| 650 |
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|a AGUA POTABLE-EL SALVADOR-ABASTECIMIENTO
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| 991 |
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|a bc_noemi
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|a 25/07/2006
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