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  1. 1
    Published 1988
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    Journal/Newspaper
  2. 2
    Published 1988
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    Journal/Newspaper
  3. 3
    Published 2014
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    Journal/Newspaper
  4. 4
  5. 5
    Published 1988
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    Journal/Newspaper
  6. 6
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  8. 8
  9. 9
  10. 10
    by National Geographic Society
    Published 1993
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    Journal/Newspaper
  11. 11
    Published 1994
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    Journal/Newspaper
  12. 12
    Published 1994
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    Journal/Newspaper
  13. 13
    Published 1994
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    Journal/Newspaper
  14. 14
    Published 1994
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    Journal/Newspaper
  15. 15
    Published 1994
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    Journal/Newspaper
  16. 16
    Published 1974
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    Journal/Newspaper
  17. 17
    Published 1974
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    Journal/Newspaper
  18. 18
  19. 19
    Published 2013
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    Journal/Newspaper
  20. 20
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