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WikiPedia: Frankfurt am Main http://www.demographia.com/db-worldua.pdf http://www.frankfurt.de http://www.frankfurt.de/ //tools.wmflabs.org/geohack/geohack.php?language=v... http://books.google.com.vn/books?id=i4agAAAAMAAJ&d... https://commons.wikimedia.org/wiki/Frankfurt_am_Ma...