File:Replacing Baltimore and Ohio Railroad Retaining Wall, 1906.jpg
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![File:Replacing Baltimore and Ohio Railroad Retaining Wall, 1906.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Replacing_Baltimore_and_Ohio_Railroad_Retaining_Wall%2C_1906.jpg/387px-Replacing_Baltimore_and_Ohio_Railroad_Retaining_Wall%2C_1906.jpg?20151003020711)
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Original file (484 × 750 pixels, file size: 120 KB, MIME type: image/jpeg)