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|a Durón Alberto, Carlos Alfonso
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|a Dosificación de concretos de piedra triturada -
|c Carlos Alfonso Durón Alberto ; Gustavo Eapinoza ; Medad Cea Guillen.
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| 260 |
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|a San Salvador :
|b Universidad de El Salvador, San Salvador, 1971.
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| 300 |
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|a Tesis ( Ingeniería Civil ) -- Universidad de El Salvador, San Salvador, 1971.
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| 500 |
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|a Pedrera la cuchilla -- Pedrera Layco -- Arena del Río Asino -- Arena del Río las Cáñas -- Estudio de loa agregados gruesos -- Grav a de pedrera la cuchilla --
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| 700 |
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|a Espinosza, Gustavo
|e caout.
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|a Cea Guillen, Medad
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|a Guzmán Urbina, Mario Angel
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