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  1. 1
    ...Geological Survey circular....
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    Government Document Serial
  2. 2
    by Chase, Edith B.
    Published 1983
    ...U.S. Geological Survey circular ;...
    Government Document Book
  3. 3
    ...U.S. Geological Survey circular....
    Government Document Serial
  4. 4
    Published 1982
    ...U.S. Geological Survey circular....
    Government Document Serial
  5. 5
    ...Geological Survey circular....
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    Government Document Serial
  6. 6
    Published 1983
    ...Geological Survey circular....
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    Government Document Serial
  7. 7
    Published 1982
    ...Geological Survey circular....
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    Government Document Serial
  8. 8
    ...Geological Survey circular....
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    Government Document Serial
  9. 9
    by Weld, Betsy A.
    Published 1962
    ...Geological Survey circular ;...
    Government Document Book
  10. 10
    ...Geological Survey circular ;...
    Government Document Book
  11. 11
    by Giusti, Ennio V., Meyer, E. L.
    Published 1977
    ...Geological Survey circular ;...
    Government Document Book
  12. 12
    by Foster, Helen Laura, 1919-
    Published 1976
    ...Geological Survey circular ;...
    Government Document Book
  13. 13
    Published 1976
    ...Geological Survey circular ;...
    Government Document Book
  14. 14
    ...Geological Survey circular ;...
    Government Document Book
  15. 15
    Published 1976
    ...Geological Survey circular ;...
    Government Document Book
  16. 16
    ...Geological Survey circular ;...
    Government Document Book
  17. 17
  18. 18
    ...Geological Survey circular ;...
    Government Document Book
  19. 19
    ...Geological Survey circular ;...
    Government Document Book
  20. 20
    ...Geological Survey circular ;...
    Government Document Book
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