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Subjects
- Sea lamprey-Control -- Great Lakes (North America)1
- Shipping -- Great Lakes (North America)1
- Shorelines -- Great Lakes Region (North America)1
- Surveyors -- Michigan.1
- Tunnels.1
- Water -- Pollution -- Great Lakes (North America)1
- Water -- Resources -- Great Lakes (North America)1
- Waterfalls.1
- Wetlands ecology -- Great Lakes Region (North America)1
- World War, 1914-1918.1