Washington from Banneker to Douglass, 1791 – 1870 (1971) co-authored by Elsie M. Lewis.[14] Washington in the New Era, 1870 – 1970 (1972) co-authored by Richard Wade.[15] Free Negroes in the District of Columbia, 1790–1846[1][16] Residence Patterns of Negroes in the District of Columbia, 1800–1860[17] Free Negroes in the Original District of Columbia[18]