Ostrup, John C.
Standard specifications for structural steel-timber-concrete and reinforced concrete - 2a ed. - New York McGraw-hill Book Company 1911 - 99 p.
ESPECIFICACIONES TECNICAS
MATERIALES DE CONSTRUCCION
MATERIALES DE SOPORTE
691:69.001.3/O83
Standard specifications for structural steel-timber-concrete and reinforced concrete - 2a ed. - New York McGraw-hill Book Company 1911 - 99 p.
ESPECIFICACIONES TECNICAS
MATERIALES DE CONSTRUCCION
MATERIALES DE SOPORTE
691:69.001.3/O83