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WikiPedia: Cầu_La_Mã ftp://imgs.ebuild.com/woc/M880252.pdf http://penelope.uchicago.edu/Thayer/E/Gazetteer/Pl... http://www.iath.virginia.edu/rome/Journal2TaylorNe... http://archive1.village.virginia.edu/spw4s/RomanFo... http://www.livius.org/pn-po/pontes_longi/pontes_lo... https://books.google.com/books?id=2-McCgAAQBAJ&pg=... https://books.google.com/books?id=5Pyh1YlfFCIC&pg=... https://books.google.com/books?id=oXlii1KgDngC&pg=... https://books.google.com/books?id=xX1JAAAAYAAJ&pg=... https://www.concreteconstruction.net/how-to/constr...