The Putumayo, the Devil's Paradise Travels in the Peruvian Amazon Region and an Account of the Atrocities Committed upon the Indians Therein - Hardenburg, W. E. (Walter Ernest), 1886-1942; Casement, Roger, 1864-1916 [Contributor]; Enock, C. Reginald (Charles Reginald), 1868-1970 [Editor]