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Kentucky Genealogy and Biography, Volume 8B, Battle-Perrin-Kniffin, 2nd ed., 1886
DR. THOMAS DEAN was born in Pike County, Ky., June 29, 1841, a son of Job and Margaret (Gannon) Dean. He received his education in the common schools, and studied medicine under Dr. E. W. Bernum, of Carter County. He began practice in Pike County, where he remained one year, and then went to Kansas for four months. He returned to Carter County and practiced with his preceptor one year, when he went to Paintville, Ky., and practiced one year; he next wend to Western Virginia for nine months, and finally located at Salyersville, Magoffin County, where in 1881 he retired from practice. He served as justice of the peace in Lawrence County two years. In 1864 he married Emily J. Graham, of Lawrence County, who died August 24, 1876. Dr. Dean next married, in 1877, Emily F. May, of Floyd County, a daughter of William and Cynthia A. (Power) May, of Pike and Magoffin Counties. The Doctor is a member of the Christian Church, and a Republican. He served two years and five months in the Federal army during the Rebellion. He was discharged, after serving this time, on account of diseases contracted while in the service of the United States, disease of heart and lungs, spleen, piles, and malarial poisoning, resulting in chronic diarrhea.