Report - NORMA TÉCNICA NTG 41017 h39 GUATEMALTECA · 2019. 10. 30. · NTG 41017 h38 (ASTM C1176/C1176M), Práctica NTG 41017 h40 (ASTM C1435/C1435M), o Método de Ensayo ASTM D1557 y debe

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