@book {TN_libero_mab2,
author = { Steinman, David B. },
title = { The builders of the bridge the story of John Roebling and his son },
publisher = {Harcourt, Brace},
year = {1945},
address = { New York },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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