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  1. 1
    Great Lakes water levels /

    Government Document Serial
  2. 2
    Charts and publications

    Government Document Serial
  3. 3
    Great Lakes water levels /

    Serial
  4. 4
    Great Lakes water levels
    Published 1971

    Government Document Serial
  5. 5
    Great Lakes water levels /

    Government Document Serial
  6. 6
    Great Lakes water levels
    Published 1971

    Government Document Serial
  7. 7
    Charts and publications

    Government Document Serial
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