Survey study for Great Lakes-St. Lawrence Seaway navigation season extension :
plan of study.
Detroit, Mich. : U.S. Army Engineer District, Detroit, Corps of Engineers, 1978.
Ice navigation /
Saint Lawrence Seaway.
Ice navigation > Ice navigation / Great Lakes (North America)
Great Lakes (North America) > Great Lakes (North America) / Commerce.
Saint Lawrence Seaway > Saint Lawrence Seaway / Commerce.
294 p. in various pagings, 4 leaves of plates :
ill., maps ;
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