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Ingram, D. (2000, February). Gridley, Richard (1711-1796), artilleryman, military engineer, and entrepreneur. American National Biography. Retrieved 9 Mar. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0100353.
Ingram, David B. "Gridley, Richard (1711-1796), artilleryman, military engineer, and entrepreneur." American National Biography. February, 2000. Oxford University Press. Date of access 9 Mar. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0100353>
Ingram, David B. "Gridley, Richard (1711-1796), artilleryman, military engineer, and entrepreneur." American National Biography. 1 Feb. 2000; Accessed 9 Mar. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0100353.