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“Early Medieval Fortifications.” Medieval Military Technology, by Kelly DeVries, University of Toronto Press, 1992, pp. 174–201, Accessed 21 Sept. 2020.
DeVries, K. (1992). Early Medieval Fortifications. In Medieval Military Technology (pp. 174-201). University of Toronto Press. Retrieved September 21, 2020, from
DeVries, Kelly. "Early Medieval Fortifications." In Medieval Military Technology, 174-201. University of Toronto Press, 1992. Accessed September 21, 2020.

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