Campbell, F. A., & Casement, R. (1910). Letter from Francis A. Campbell to Roger Casement informing him Sir Edward Grey has chosen Casement to proceed to the Putumayo in connection with the commission of inquiry into the treatment of the natives and the possibilities of commercial development, and providing details on said commission.

Campbell, Francis A., and Roger Casement. Letter from Francis A. Campbell to Roger Casement Informing Him Sir Edward Grey Has Chosen Casement to Proceed to the Putumayo in Connection with the Commission of Inquiry into the Treatment of the Natives and the Possibilities of Commercial Development, and Providing Details on Said Commission. 1910.