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Locks (Hydraulic engineering)--Maintenance and repair

Locks (Hydraulic engineering)--Maintenance and repair

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DPA0793
Ships waiting for passage, St. Mary's Falls Canal, Sault Ste. Marie
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DPA0792
Repairing broken valve, St. Mary's Falls Canal, Sault Ste. Marie
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DPA0791
Repairing broken valve, St. Mary's Falls Canal, Sault Ste. Marie
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DPA0789
Repairing broken valve, St. Mary's Falls Canal, Sault Ste. Marie
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