..."There was a time, duringthe late war," says Clarkson, "when the slave trade may beconsidered as having been nearly abolished... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
... Clarkson, Impolicy of the Slave-Trade, pp...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...In England, the united efforts of Sharpe, Clarkson, andWilberforce early began to arouse public opinion by means ofagitation and pamphlet literature...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Hammond of South Carolina, in Letters to Clarkson, No...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Thomas Clarkson...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Letters on Southern Slavery: addressedto Thomas Clarkson...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
... For the only possible pretence of attack was the notion of Thomas Clarkson having assumed the priority, and these letters can have no earthly relation to that point...
Thomas Clarkson 「The History of the Rise, Progress and Accomplishment of the」
... The vindication of Thomas Clarkson has been triumphant; the punishment of his traducers has been exemplary...
Thomas Clarkson 「The History of the Rise, Progress and Accomplishment of the」
...John Clarkson, however, brother of ThomasClarkson, the abolitionist, eventually took the lead, founded Freetown,and the colony began its checkered career...
W.E.B. Du Bois 「The Negro」
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