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Correspondence from contributors 1958 1973-1975
First period: Issues 1-40 1973-05-1976-08
Second period: Issues 41-53 1986-04-1987-04
Third period: Issues 54-80 1987-10-1990-06
Fourth period ( Adios Crisis, Fin de Siglo): Issues 1-18 1987-07-1988-12