English: The Panama Canal locks under construction, in 1910. The partly-constructed middle wall is shown here; the large pipe near the bottom is the culvert used to carry water into the locks. The man standing below and right of it illustrates the scale.
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The Panama Canal, An address to the National Geographic Society, by Colonel Goethals, February 10, 1911.
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The Panama Canal locks under construction, in 1910. The partly-constructed middle wall is shown here; the large pipe near the bottom is the culvert used to carry water into the locks. The man standing below and right of it illustrates the scale.
The Panama Canal locks under construction, in 1910. The partly-constructed middle wall is shown here; the large pipe near the bottom is the culvert used to carry water into the locks. The man standing below and right of