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Block, S. (2000, February). Newton, Robert Safford (1818-1881), physician. American National Biography. Retrieved 6 Mar. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1200662.
Block, Stanley L. "Newton, Robert Safford (1818-1881), physician." American National Biography. February, 2000. Oxford University Press. Date of access 6 Mar. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1200662>
Block, Stanley L. "Newton, Robert Safford (1818-1881), physician." American National Biography. 1 Feb. 2000; Accessed 6 Mar. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1200662.