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- Source
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- U.S. Army Corps of Engineers - Detroit 28
- Upper Lakes Shipping 19
- CSL 18
- Algoma Central 15
- Great Lakes Dredge & Dock 15
- U.S. Army Corps of Engineers - Detroit 28
- Upper Lakes Shipping 19
- CSL 18
- Algoma Central 15
- Great Lakes Dredge & Dock 15
- Boland & Cornelius 12
- Paterson 12
- Hall Corp. 11
- U.S. Army Engineers - Buffalo 9
- USS GLF 9
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- Misener 7
- Societe des Traversiers du Quebec 7
- Calumet Marine Towing 6
- Carryore 6
- Erie Sand Steamship 6
- Huron Cement 6
- Kishman Fish 6
- MacDonald Marine Tug 6
- Hanna Mining Company 5
- Inland Steel Company 5
- Interlake Steamship Company 5
- Sivertson Fisheries 5
- St. Lawrence Seaway Authority 5
- A. B. McLean 4
- Canadian Dredge & Dock 4
- Chicago FD 4
- Falcon Marine 4
- Gaelic Tugboat 4
- Rouge Steel (Ford) 4
- Shell Canadian 4
- Washington Island Ferry 4
- Western Engineering 4
- A. B. McLean & Sons 3
- American Canadian Lock Tours 3
- Beacon Hausheer 3
- Bethlehem Steel 3
- C&O RR 3
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- Cleveland Tankers 3
- Detroit FD 3
- Esso Petroleum 3
- Esso Petroleum Canada 3
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- Gulf Canada 3
- Halco 3
- Lock Tours Canada 3
- Logistec Navigation 3
- Marine Fueling 3
- Miller Boat Line 3
- Misener Steamships 3
- Purvis Brothers 3
- Thunder Bay Marine Services 3
- Westdale 3
- Allouez Marine Supply 2
- Amoco Oil 2
- Apostle Islands Cruise 2
- Bob-Lo 2
- Bowaters 2
- Canadian National RR 2
- Famous Soo Lock Cruises 2
- Gallagher Marine 2
- Johnstone Shipping 2
- Lee Marine 2
- Long Sault Boat 2
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- Mercury Sightseeing 2
- Monroe Contractors 2
- National Park Service 2
- Neuman Boat Line 2
- Norfolk & Western RR 2
- Papeterie Reed 2
- Pringle Transit 2
- Purvis Marine 2
- Selvick Marine Towing 2
- Societe des Traversiers Quebec 2
- St. Lawrence Seaway Development 2
- Star Line Mackinac Island 2
- Texaco Canada 2
- Three Rivers Boatman 2
- ASC 1
- Algoma Steel 1
- Allied Oil 1
- Allied Tug & Barge 1
- Argyle II Ltd. 1
- Atomic Ark Marine Store 1
- Blue Water Ferry 1
- Bowater Newfoundland 1
- Bowaters Newfoundland 1
- Buffalo FD 1
- Cement Transit 1
- Cie D'Excursions Maritimes 1
- Cleveland FD 1
- Consolidated West Petroleum 1
- Consolidation Coal 1
- Duluth Superior Excursions 1
- Eder Barge & Towing 1
- Erickson Marine Freight 1
- Ferris Marine 1
- Ferriss Marine 1