Jerome, L. J., & Casement, R. (1912). Letter from Lucien J. Jerome to Roger Casement about having traced down "Martingui", "des Graz's" ill health, and how his memo specifies that the "Peruvian government were cognisant of and approved tacitly the Putumayo crimes".

Jerome, Lucien Joseph, and Roger Casement. Letter from Lucien J. Jerome to Roger Casement About Having Traced Down "Martingui", "Des Graz's" Ill Health, and How His Memo Specifies That the "Peruvian Government Were Cognisant of and Approved Tacitly the Putumayo Crimes". 1912.