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  1. 1
    by Coombs, J.
    Published 1986
    Book
  2. 2
    Book
  3. 3
  4. 4
    Published 1980
    Book
  5. 5
    Published 1978
    Conference Proceeding Book
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
    by Edington, John M.
    Published 1986
    Book
  13. 13
    Published 1978
    Serial
  14. 14
    by Ehrlich, Paul R., Ehrlich, Anne H.
    Published 1981
    Book
  15. 15
  16. 16
    Published 1990
    Journal
  17. 17
    Published 1992
    Book
  18. 18
  19. 19
    Published 1992
    Book
  20. 20
    Published 1994
    Book
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