au.\*:("SWIFT PM")
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ECONOMICS OF WINTER NAVIGATION IN THE GREAT LAKES AND ST. LAWRENCE SEAWAYSWIFT PM; BENFORD H.1975; SOC. NAV. ARCHITECTS MAR. ENGRS, TRANS; U.S.A.; DA. 1975; VOL. 83; PP. 299-316; BIBL. 25REF.Article
