The West Indies 1837 : being the journal of a visit to Antigua, Montserrat, Dominica, St. Lucia, Barbados, and Jamaica ; undertaken for the purpose of ascertaining the actual condition of the negro population of those islands

The slaves of Timbuktu

Maugham, Robin, (1964)

The cotton kingdom : a traveller's observations on cotton and slavery in the American slave states ; based upon three former volumes of journeys and investigations by the same author

Olmsted, Frederick Law, (1953)

American negro slavery. A survey of the supply, employment and control of Negro labor as determined by the plantation regime

Phillips, Ulrich Bonnell, (1966)