The original four volumes of the collected works of Frederick Douglass included a substantial number of his Writings and speeches but far from all of them.
Subsequently this became possible and the present, Supplementary Volume covering the Writings of Douglass over the important period from 1844 to 1860 wa.
At the time the first volumes of Douglass\' Writings and speeches were published (1950-1955), the possibilities of incorporating the other unpublished material were remote.
The original four volumes of the collected works of Frederick Douglass included a substantial number of his Writings and speeches but far from all of them