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      Temporary coverage
      1930-1950 [1]
      1970-2019 [1]
      1996 -2018 [1]
      2010-2020 [1]
      2018-2019 [1]
      2019-2020 [1]
      2020-250 [1]
      Práctica Educativa [1]
      Siglo XXI [1]