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Survey study for Great Lakes-St. Lawrence Seaway navigation season extension : plan of study.

Title:Survey study for Great Lakes-St. Lawrence Seaway navigation season extension : plan of study.
Author:
Note:U.S. Army Engineer District, Detroit, Corps of Engineers, 1978
  
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Subject:Great Lakes (North America) -- Commerce
Subject:Ice navigation -- Great Lakes (North America)
Subject:Ice navigation -- Saint Lawrence Seaway
Subject:Saint Lawrence Seaway -- Commerce
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