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U.S. troops in the Caribbean area constructing a single-span stringer bridge of bamboo. They are spreading the mat over the second layer of clay
Casselman River Bridge on the National Road was the longest single-span stone arch in the United States when the bridge was built in 1819, Grantsville, Maryland

Casselman River Bridge on the National Road was the longest single-spa...

Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More