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- U.S. Army Corps of Engineers - Detroit 32
- CSL 28
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- Great Lakes Dredge & Dock 16
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- U.S. Army Corps of Engineers - Detroit 32
- CSL 28
- Upper Lakes Shipping 24
- Great Lakes Dredge & Dock 16
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- Selvick Marine Towing 2
- St. Lawrence Seaway Development 2
- U.S. EPA 2
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- Wendella Sightseeing 2
- ASC 1
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- Argyle II Ltd. 1
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- Cement Transit 1