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Books by Mich.) Great Lakes-St. Lawrence Seaway Winter Navigation Seminar (1972 : Detroit:

Books in the extended shelves:

• Great Lakes-St. Lawrence Seaway Winter Navigation Seminar (1972 : Detroit, Mich.): Proceedings. ([Place of publication not identified], 1973) (page images at HathiTrust)
• Great Lakes-St. Lawrence Seaway Winter Navigation Seminar (1972 : Detroit, Mich.): Proceedings : Great Lakes-St. Lawrence Seaway Winter Navigation Seminar, Detroit, December 5-6, 1972. (s.n., 1973), also by United States. Dept. of the Army and Great Lakes-St. Lawrence Seaway Winter Navigation Board (page images at HathiTrust)

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