NARA published a Special edition of their Prologue Magazine (available online), which included useful information on researching Black Women during the Reconstruction Period. ¹

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¹ Frankel, Noralee. "From Slave Women to Free Women" The National Archives and Black Women's History in the Civil War Era." © Prologue Magazine - Special Issue on Federal Records and African American History 1997. 17 Oct 2005.