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Neubauer, B. (2000, February). Gibbs, George (1815-1873), ethnographer, geologist, and historian. American National Biography. Retrieved 8 Mar. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1400222.
Neubauer, Bethany. "Gibbs, George (1815-1873), ethnographer, geologist, and historian." American National Biography. February, 2000. Oxford University Press. Date of access 8 Mar. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1400222>
Neubauer, Bethany. "Gibbs, George (1815-1873), ethnographer, geologist, and historian." American National Biography. 1 Feb. 2000; Accessed 8 Mar. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1400222.