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Subject
- Ice breaking operations.[remove]4
- Icebreakers (Ships)3
- Icebergs.2
- International Ice Patrol.2
- Navigation--Safety measures.2
- United States. Coast Guard.2
- Boats and boating--Sweden.1
- Great Lakes (North America)--Description and travel.1
- Lifeboats.1
- Modoc (Ship)1
- Ships.1
- Stockholm (Sweden)--Description and travel.1
- Tugboats.1