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Ancestry.com. The history of Negro servitude in Illinois : and of the slavery agitation in that state, 1719-1864 / by N. Dwight Harris. [webbaserad databas]. Provo, UT: Ancestry.com Operations Inc, 2005.Originaldata: Harris, Norman Dwight,. The history of Negro servitude in Illinois : and of the slavery agitation in that state, 1719-1864 / by N. Dwight Harris.. Chicago: A.C. McClurg & Co., 1904.