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  1. 1
    by Krebs, J. R. (John R.)
    Published 1987
    Book
  2. 2
    by Krebs, J. R. (John R.)
    Published 1981
    Book
  3. 3
    Published 1984
    Book
  4. 4
    Published 1978
    Book
  5. 5
    Published 1984
    Book
  6. 6
    Published 1991
    Book
  7. 7
    Published 1997
    Book
  8. 8
    by Krebs, J. R. (John R.)
    Published 1993
    Book
  9. 9
    Book
  10. 10
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