Ice observations. Canadian inland waterways.

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Item Link Original Source
Limited (search only)   1965 University of Illinois at Urbana-Champaign
Limited (search only)   1966 University of Illinois at Urbana-Champaign
Limited (search only)   1968 University of Illinois at Urbana-Champaign
Limited (search only)   1970 University of Illinois at Urbana-Champaign