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Publications

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  34. Cover

Notes

  • No data available for before 1980, 1982–1985, 1987–1989, 1996.
  • Data is incomplete for 1980, 1981, 1986, 1990, 1991, 1994 and 1997.
  • Specific dates (rather than just a year) only recorded in the 1980s and since 2005.
  • Reading of periodicals only recorded since 2005.