-Existencias: 1954 no. 8-9; 1955 no. 2-5, 7-9, 11-12; 1956 no. ene-mar, may-dic; 1957 no. ene-jun, ago-sep, nov-dic; 1958 no. ene-abr, jun-dic; 1959 no. ene, mar-jun, oct-dic; 1960 no. ene-may, jul-sep, nov-dic; 1961 no. ene-abr, jun-nov; 1962 no. ene-jun, sep-dic; 1963 no. ene-jun, sep-dic; 1964 no. feb-ago, oct-dic; 1965 no. ene-ago, nov-dic; 1966 no. ene, mar-abr, jun-oct, dic; 1967 no. ene-jun, ago-oct, dic; 1968 no. ene-feb, jun-dic; 1969 no. ene-feb, may-jun, ago-sep, nov-dic; 1970 no.abr, jun-dic; 1971 no. ene, mar, may, ago-dic; 1972 no. ago-sep; 1973 no.mar, jun, dic.; 1974 no. may, nov-dic; 1975 no. jun; 1980 no. feb-mar; 1989 no. ene-dic; 1990 no. ene-dic; 1992 no.ene-dic; 1993 no. ene-dic; 1994 no. ene-dic; 1995 no.ene-dic; 1996 no. ene-dic; 1997 no. ene-dic; 1998 no. ene-dic; 1999 no. ene-dic; 2000 no. ene-dic; 2001 no. ene-dic