text cl 1977 1987 continuing a Existencias : (1977 : 2, 4); (1978 : 2-4); (1979 : 2, 4); (1980 : 1-3); 1981-1982; (1983 : 2-4); (1984 : 2); (1987 : 1) Tecnologia Educacional AR-ReUNN 260701 20260702141348.0 104876 spa