Eggert, Gerald (15 January 2008). "How to "Blow In" a Newly Built or a Cold Iron Furnace". Medieval Studies. Medieval Technology and American History. One-Minute Essays. Penn State University. Archived from the original on 26 September 2023. Retrieved 18 February 2024.
Eggert, Gerald (15 January 2008). "How to "Blow In" a Newly Built or a Cold Iron Furnace". Medieval Studies. Medieval Technology and American History. One-Minute Essays. Penn State University. Archived from the original on 26 September 2023. Retrieved 18 February 2024.