-Existencias: 1949 v. 2, no. 4, 6; 1950 v. 3, no. 2-4, ed. especial; 1951 v. 4, no. 1-3, 5-6; 1952-1953 v. 5, no. 1, 3-6; 1953-1954 v. 6, no. 2-3, 5-6; 1954-1955 v. 7, no. 1-4, 6; 1956-1957 v. 8, no. 2-6; 1957-1958 v. 9, no. 2-4, 6; 1958-1959 v. 10, no. 1-6; 1960-1962 v. 11, no. 1-6; 1962-1963 v. 12, no. 2-4; 1963-1964 v. 13, no. 1-4; 1964 v. 14, no. 1, 4; 1965-1966 v. 15, no. 1, 4