_A Caution to Great Britain and Her Colonies in a Short Representation of the calamitous State of the enslaved Negro in the British Dominions_.

(Philadelphia, 1784.) -- ----_The Case of our Fellow-Creatures, the oppressed Africans, respectfully recommended to the serious Consideration of the Legislature of Great Britain, by the People called Quakers_.

(London, 1783.) -- ----_Observations on the enslaving, Importing and Purchasing of Negroes; with some Advice thereon, extracted from the Epistle of the Yearly-Meeting of the People called Quakers, held at London in the Year 1748_.

(Germantown, 1760.) -- ----_The Potent Enemies of America laid open: being some Account of the baneful Effects attending the Use of distilled spirituous Liquors, and the Slavery of the Negroes_.

(Philadelphia.) -- ----_A Short Account of that Part of Africa, inhabited by the Negroes.
With respect to the Fertility of the Country; the good Disposition of many of the Natives, and the Manner by which the Slave Trade is carried on_.
(Philadelphia, 1792) -- ----_Short Observations on Slavery, introductory to Some Extracts from the Writings of the Abbe Raynal, on the Important Subject_.
-- ----_Some Historical Account of Guinea, its Situation, Produce, and the General Disposition of its Inhabitants.