found: McIntosh, W.L. Geologic map index of Michigan, 1978:t.p. (Margaret F. Eister, Dept. of the Interior, U.S. Geological Survey)
found: LC data base, 11-1-84(hdg.: Eister, Margaret F.)
found: Fuller, H. K. Geologic index map of Maryland, Delaware ... 1987:text accomp. map (Compilation by M.F. Eister)
found: Washington Post, 7 June 2003, viewed online 25 July 2022(Margaret F. Eister; age 76 [born circa 1927]; worked for U.S. Geological Survey for 30 years before retiring in 1982 as an information specialist in the office of geologic inquiries; died 5 June 2003 at her home in Mount Jackson, Va.; Washington native who graduated from Radcliffe College; did graduate work in geography at Pennsylvania State and George Washington universities; worked for War Department at the end of WWII; moved from Reston to Mount Jackson after death of her husband, William A. Eister, in 1979; daughter: Katherine Fisher of Herndon) - https://www.washingtonpost.com/archive/local/2003/06/07/obituaries/41c31048-7a10-4a9e-9d37-121326e05435/
found: Ancestry.com, viewed 25 July 2022:Virginia Marriage Records for Katherin Eister (Margaret Morrow Ford; spouse: William Albert Eister) Find a grave (Margaret Eister; Margaret Liston Eister; Margaret Ann Liston Ford Eister; birth: 18 Mar 1927, Washington, D.C.; death: 5 Jun 2003, Mount Jackson, Virginia; burial: Culpeper, Virginia)