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Isometric drawing, Dunlap's Creek Bridge, Spanning Dunlap's Creek, Brownsville, Fayette County, Pa.
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This drawing shows the hollow, cast-iron arches that supported the bracing, floor plates, and macadam road surface above.

Credit: Library of Congress

This drawing shows the hollow, cast-iron arches that supported the bracing, floor plates, and macadam road surface above.

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