pedro miguel lock site, site

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Pedro Miguel Lock site, excavations, looking south down to grade, Pana...

Picryl description: Public domain image of a coal mine, industrial facility, mining industry, early 20th-century industrial architecture, free to use, no copyright restrictions.

[A concrete mixer at work at Pedro Miguel Lock site, Panama Canal]

J138112 U.S. Copyright Office. Public domain photograph of quarry, mining industry, miners, free to use, no copyright restrictions image - Picryl description