Economic Co-operation Among Negro Americans: Report of a Social Study Made by Atlanta University Under the Patronage of the Carnegie Institution of Washington, D.C., Together With the Proceedings of the 12th Conference for the Study of the Negro Problems, Held at Atlanta University, on Tuesday, May the 28th, 1907 (Atlanta University Publications #12; 1907), ed. by W. E. B. Du Bois, contrib. by Conference for the Study of the Negro Problems (multiple formats at archive.org)
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