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WikiPedia: Ryōseikoku http://books.google.com/books?id=Hv99D510nHcC&pg=P... http://books.google.com/books?id=aAeQREc0vz0C&pg=P... http://books.google.com/books?id=p2QnPijAEmEC&clie... //books.google.com/books?id=p2QnPijAEmEC&pg=PA780 http://www.samurai-archives.com http://www.maproom.org/00/05/index.php http://www.worldcat.org/oclc/58053128?referer=di&h...