Halberg, Simon. “Birth of the Sleepless Land: The Arrival of the Sugar Beet and Some Ethnological Observations on the Steam Plough and Its Fossil Mode of Operation in Scandinavian Agriculture Ca. 1880”. Ethnologia Fennica 50, no. 1 (June 8, 2023): 108–140. Accessed June 29, 2024. https://journal.fi/ethnolfenn/article/view/112816.