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1. Aerial Bridge: Proposed Suspended Car Transfer Over Ship Canal at Duluth, Minnesota

2. Aerial Bridge: Proposed Changes in Tower Suspended Car Transfer Over Ship Canal at Duluth, Minnesota

3. Aerial Bridge: Details of Traveler Framing at Top Suspended Car Transfer Ship Canal, Duluth, Minnesota

4. Aerial Bridge: Detail of Car Suspended Car Transfer Over Ship Canal, Duluth, Minnesota

5. Aerial Bridge: Detail of Car Suspended Car Transfer Over Ship Canal at Duluth, Minnesota

6. Aerial Bridge: Details of Traveler Suspended Car Transfer Over Ship Canal, Duluth, Minnesota

7. Aerial Bridge: Design for Suspended Car Transfer Over Ship Canal, Duluth, Minnesota

8. Building plan for a whaleback vessel, West Superior, Wisconsin

9. Building plan for a whaleback vessel, West Superior, Wisconsin

10. Building plan for a whaleback vessel, West Superior, Wisconsin

11. Building plan for a whaleback vessel, West Superior, Wisconsin

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