Ｊａｐａｎｅｓｅ　Ｓｗｏｒｄｓ　ＣＵＬＴＵＲＡＬ　ＩＣＯＮＳ　ＯＦ　Ａ　ＮＡＴＩＯＮ　Ｔｈｅ　Ｈｉｓｔｏｒｙ，Ｍｅｔａｌｌｕｒｇｙ　ａｎｄ　Ｉｃｏｎｏ