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The Thomas Clarkson manuscript, arranged in 13 letters, addresses various aspects of the slave trade in the region that lies between the Gambia and Senegal Rivers.

The manuscript, arranged in 13 letters, addresses various aspects of the slave trade in the region that lies between the Gambia and Senegal Rivers, the region that historically comprised the three "Kingdoms" of Cayor, Sin and Sallum, and bordered by the "Kingdoms" of the Wolof (Oualo) and Bambara. From this region, Clarkson estimated an annual trade of 2,240 slaves, of whom approximately 1,790 passed through the French Fort St. Louis and 450 through Gorée. Like Mungo Park, Clarkson found that the most common method employed to capture slaves is "pillage," or the organization of forces by the King of a region for secret raids on neighboring villages from which men and women are kidnapped.

Clarkson's letters include geographic and, to a degree, ethnographic notes on the region, plus detailed information on the means of acquisition, transport, and handling of enslaved individuals in Africa and on the Middle Passage. While Clarkson is strongly concerned with the moral issues raised by the slave-trade, the manuscript is designed partially to sway the opinion of politicians and often assumes an informational tone. He constructs his narrative so that the moral issues arise "naturally" from a consideration of the "facts" presented.

The manuscript contains nine illustrations, including a map of the region under study, several illustrations of implements used to restrain captives, two hand colored copper-plate engravings of African scenes, and a printed version of Clarkson's well-known diagrammatic cross section of a slave ship. There is at least one reference in the text to an illustration no longer present.

The association of this manuscript with Mirabeau is primarily circumstantial, and there are a number of differences between this version and the loose translation published in 1791. On the supporting side, however, a slip of paper in contemporary hand notes "title and table of contents in the hand of Mentelle," referring to Edmé Mentelle, close associate of Mirabeau. Secondly, one page of notes (p. 1) appears to indicate "cet oeuvrage appartient au Citoyen Mentelle," though Mentelle is strongly effaced, and makes reference to comments on the text by Geoffroy de Villeneuve. In the published English language version of his letters to Mirabeau, Clarkson cites Villeneuve, aide-de-camp to the Governor of Gorée, as his source of information for the African sections.

The Thomas Leyland Company account books are two volumes of records for the slave ships Hannah (1789-90) and Jenny (1792-1793), traveling from Liverpool to Africa, then across the Atlantic to Jamaica and other West Indian Islands. The books record the goods sold in each port, such as slaves, fabric, and sugar, and contain details on seamen's wages and instructions to the captain for the treatment of slaves.

The Thomas Leyland Company account books are two volumes of records for the slave ships Hannah (1789-90) and Jenny (1792-1793), which made trips from Liverpool to Africa, then across the Atlantic to Jamaica and other West Indian Islands. These record the goods (sugar, food, arms, and cloth) and slaves sold in each port, and contain details on seamen's wages and instructions to ship captains for the treatment of slaves.

The first volume documents the 2nd voyage of the Ship Hannah, captained by Charles Wilson (39 pages). The ship sailed from Liverpool on July 3, 1789, to the Calabar River in Africa (present day Nigeria), then to Barbadoes; Dominica; and Kingston, Jamaica; and finally back to Liverpool in December 1790.

The account book opens with directions to the captain, instructing him on the ship's itinerary and what to sell and purchase on the journey. The note also cautioned the captain to treat his crew with humanity and to show the "utmost tenderness to the Negroes" (page 1). The next item is the shipment invoice, which includes food (white barley, corn, rice, peas, beans, beef, salt, and bread), liquor (brandy, port, sherry), china, fabric and clothing (hats, trousers, jackets, silk, cotton, romal and photaes), arms (gunpowder, muskets, French guns, and knives), and purchased items including tobacco, wine, rum, sugar, raisins, cotton, sailcloth, iron, and gunpowder (pages 5-13). Page 15 contains a list of the 30 officers and seamen on board the Hannah, with their names, rank or profession, wages per month, and total pay. Professions included master, mate, carpenter, cooper, steward, surgeon, cook, and seaman. Pages 16-20 contain lists of trader's names along with notes on disbursements and what they purchased. Pages 22-24 cover accounts for the 294 slaves sold at Kingston, Jamaica, with details on the purchasers, prices, and types of slaves sold (privileged men, privileged women, cargo men, cargo women, men boys, women girls, boys, and girls). Finally, pages 25-32 provide information about the total amount of sugar purchased in Jamaica for Thomas Leyland, and the accounts of goods sold to various traders in the West Indies, including William Daggers of Kingston, Jamaica; Barton and Gibbald of Barbados; and Neilson and Heathcote of Dominica.

The second volume documents the first voyage of the Ship Jenny, captained by William Stringer (29 pages). The Jenny left Liverpool on November 27, 1792, and arrived at the Zaire River (Congo) off the coast of Angola on February 18, 1793. They arrived at the port town of Emboma (today Boma, Kongo Central) on February 23, 1793, then at Barbadoes (May 6, 1793), St. Vincent (May 7, 1793), Grenada (May 8, 1793), and finally Kingston, Jamaica (May 18, 1793).

The record keeping for both volumes is similar. The account book opens with an itinerary of the trade mission and instructions for the captain on selling and purchasing cargo (pages 1-3). Following that are the invoice for goods shipped and purchased (page 5-14), a list of the 29 officers and seamen on board (page 15), tradesmen's notes and disbursements (pages 16-20), sales for 250 slaves (pages 21-23), and accounts with Thomas Leyland, who funded the expedition (pages 24-29).