6. "The Suppression of the Slave Trade" (Harvard Historical Monographs, No. 1) 335 pp. Longmans, 1896.
7. Atlanta University Publications:
No. 3, "Efforts for Social Betterment," 66 pp. 1898.
No. 4, "The Negro in Business," 77 pp. 1899.
No. 7, "The Negro Artisan," 192 pp. 1902.
8. Bulletins of the United States Department of Labor.
Nos. 10, 14, 22, 32, 35, 37, 38, 48.
9. United States: Report of the Industrial Commission 1901-2, 19 vols.
10. Proceedings of the American Economic Association, 1906.