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Crist, R., & Williams, P. (2000, February). Armstrong, John (1717-1795), soldier, surveyor, and member of the Continental Congress. American National Biography. Retrieved 16 Apr. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0100029.
Crist, Robert Grant, and Patrick G. Williams. "Armstrong, John (1717-1795), soldier, surveyor, and member of the Continental Congress." American National Biography. February, 2000. Oxford University Press. Date of access 16 Apr. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0100029>
Crist, Robert Grant, and Patrick G. Williams. "Armstrong, John (1717-1795), soldier, surveyor, and member of the Continental Congress." American National Biography. 1 Feb. 2000; Accessed 16 Apr. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0100029.