Ice observations. Canadian inland waterways.
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Item Link | Original Source |
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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 |