found: Maria Newman's musical stories. Vol. I, p1992:container (Mary De Morgan) insert (b. Feb. 24, 1850 in London; d. May 17, 1907 in Egypt; referred to as Mrs. Oakchest)
found: DLC in OCLC, Sept. 6, 1997(hdg.: De Morgan, Mary; usage: Mary De Morgan)
found: Information from 678 converted Dec. 16, 2014(Mary Augusta De Morgan, daughter of Sophia Elizabeth De Morgan and Augustus De Morgan.)
found: Wikipedia, November 30, 2016(Mary de Morgan; (24 February 1850-1907) was an English writer and the author of three volumes of fairytales; died in Cairo, Egypt in 1907; member of the women's suffragist group the Women's Franchise League)