TUBERIA PLASTICA: REQUISITOS BROMATOLOGICOS - 1A ED. - Ecuador INEN 1986 S.L. D-14582 S/100 INEN BIBL. 28.06.94 NORMA INEN : 1372 1986-01 general impreso DONACION LCCN: 1112 Dewey Class. No.: 620.4