00350nam a2200145   450000100060000000300030000600500170000900800410002603500190006703500180008605000190010410000220012324500290014526000300017418854UR20220428191251.0061103|||||||||||||||||||||||||||||||| d  a(janium) 18843  a(janium)18842 4aR114b.P4 19991 aPerez Tamayo, Ruy10aArticulos de divulgacion  bEl Colegio Nacionalc1999