| http://www.w3.org/ns/prov#value | - Select Committee Appointed to Consider the Best Means Which Great Britain Can Adopt for the Final Extinction of the African Slave Trade (page images at HathiTrust) The Congo State; or, The growth of civilisation in Central Africa, (London, Thacker, 1898), by Demetrius Charles Boulger (page images at HathiTrust) The history of slavery and the slave trade : ancient and modern ; the forms of slavery
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