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  1. 1
    Published 1967
    Subjects “...Sea ice Observers' manuals....”
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    Manual of ice observing and reporting procedures /
  2. 2
    Published 1968
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    Observaciones de hielos.
  3. 3
    Published 1987
    Subjects “...Sea ice Observers' manuals....”
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    Ice observation handbook, 1987 /

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