The article says "And Isidore Ndaywel è Nziem, a Congolese scholar whose Histoire générale du Congo was published the same year as King Leopold's Ghost, estimated the death toll in the Léopold era and its immediate aftermath at roughly 13 million, a higher figure than the various scholarly estimates Hochschild cites." Yet the Congo Free State article quotes this author at 10 million. So three million less deaths. Why this discrepancy?