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All Bones Considered: Laurel Hill Stories #066 - Laurel Hill and the Panama Canal, Part 3
Charles Day was a master builder. His Philadelphia firm Day & Zimmerman was first to pour concrete at the massive Culebra locks, which worked perfectly from day one.
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All Bones Considered: Laurel Hill Stories #066 - Laurel Hill and the Panama Canal, Part 3
Charles Day was a master builder. His Philadelphia firm Day & Zimmerman was first to pour concrete at the massive Culebra locks, which worked perfectly from day one.
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