Unidentified photographer 1913 (published) Chained Indian rubber gatherers in the stocks: on the Putumayo River
Book illustration Internet Archive W.E. Hardenburg (ed.), 1913, The Putumayo - The Devil's Paradise: Travels in the Peruvian Amazon region and an account of the atrocities committed upon the Indians therein, (London: T. Fisher Unwin), frontispiece
