found:His The Monroe doctrine, 1823-1826.
found:A history of the Monroe doctrine, 1963:t.p. (Dexter Perkins)
found:New York Times, via WWW, viewed May 16, 2016:obituary dated May 16, 1984 (Dexter Perkins; born in Boston; died Saturday [May 12, 1984] in Rochester [New York] aged 94; expert on U.S. diplomatic history and chairman of the history department at the University of Rochester from 1925-1954; also taught at Cornell University, Cambridge University, and Uppsala University; author of 17 books)
found:Wikipedia, viewed May 16, 2016(Dexter Perkins, 1889-1984)