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2. Birk, Douglas A. (2006) Firearms and Ordinance from 21PN11: An 1804-05 North West Company Wintering Post Site in East Central Minnesota. Submitted to the Minnesota Historical Society, Archaeological Department, St. Paul.
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4. de Lotbiniere, Seymour (1984) Updating Skertchly. In The Manufacture of Gunflints. Memoirs of the Geological Survey of England and Wales, by Sydney B. J. Skertchly, pp. v–xiii. Museum Restoration Service, Alexandria Bay, New York. Originally published 1879, Her Majesty’s Stationery Office, London.
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