Humphrey, E. P. 1. (1877). The color question in the United States: A paper prepared for the sixtieth annual meeting of the American Colonization Society, Washington, D.C., January 16, 1877. Washington City: Colonization building.

Humphrey, Edward P. 1809-1897. The Color Question in the United States: A Paper Prepared for the Sixtieth Annual Meeting of the American Colonization Society, Washington, D.C., January 16, 1877. Washington City: Colonization building, 1877.

Humphrey, Edward P. 1809-1897. The Color Question in the United States: A Paper Prepared for the Sixtieth Annual Meeting of the American Colonization Society, Washington, D.C., January 16, 1877. Washington City: Colonization building, 1877.