| Unidentified photographer Chained Indian rubber gatherers in the stocks: on the Putumayo River 1913 (published) Book illustration Internet Archive LL/73144 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
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