A voyage to the river Sierra-Leone, on the coast of Africa : containing an account of the trade and productions of the country, and of the civil and religious customs and manners of the people ; in a series of letters to a friend in England. / by John Matthews, lieutenant in the Royal Navy, during his residence in that country in the years 1785, 1786, and 1787 ; with an additional letter on the subject of the African slave trade. Also, a chart of part of the coast of Africa from Cape St. Ann, to the river Rionoonas ; with a view of the island Bananas. To which are added, eight plates of the views of the country, and of instruments.