Symposium on structure of portland cement paste and concrete : Subject classification : 32 cement and concrete - 492 páginas - Publicacion / national research council ; 1389 Special report / national research council ; 90 . Subjects--Topical Terms: Concreto--Pruebas--CongresosCemento Portland--Pruebas--Congresos LC Class. No.: TA439 / S95 1965