Before revision: Leiden 1996: Brill Publishers Furnaces such as Lapphyttan in Sweden may date back to the 12th century; and some in Mark (today part of Westphalia, Germany ) to the 13th .Several papers in The importance of ironmaking: technical innovation and social change: papers presented at the Norberg Conference, May 1995 ed.
After revision: Leiden 1996: Brill Publishers Furnaces such as Lapphyttan in Sweden may date back to the 12th century; and some in the County of Mark dating to the 13th century, which is now part of Westphalia, Germany .Several papers in The importance of ironmaking: technical innovation and social change: papers presented at the Norberg Conference, May 1995 ed.