Note: 1850 U.S. Federal Census [see father's listing]
1860 U.S. Federal Census searching....Mary with husband William R. Jacobs and daughter Virginia
1870 U.S. Federal Census [see 2nd husband's listing]
1880 U.S. Federal Census Mason County, West Virginia Clendennin Duncan, John W. 39 Duncan, Mary L. 41 wife Jacob, Virginia E. W F 22 stepdaughter Hensen, Oscar P. W M 1 no relationship listed (250D+251A in file)
1900 U.S. Federal Census searching....
Not to be confused with Mary E. Duncan who died 8 June 1905, wife of Jackson Duncan, and informant of death being Katie Duncan, daughter (d. 8 Jan 1908). (4 entries in file)
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