Lacerda left a valuable record of his adventurous journey; but with Mungo Park and Lacerda the history of African exploration in the 18th century closes.
In 1795 Mungo Park was sent out by the African Association, and was the first European to see and describe the upper river.
The headquarters of the West African Frontier Force had been at Jebba, not far from the point at which Mungo Park had lost his life upon the river.
When Mungo Park returned in 1796 from his celebrated journey in Africa, Edwards, who was secretary of the Association for Promoting the Discovery of the Interior Parts of Africa, drew up from Park's narrative an account of his travels, which was published by the association in their Proceedings; and when Park wrote an account of his journeys he availed himself of Edwards' assistance.
His most valuable works include the Bengal Atlas (1779), the first approximately correct map of India (1783), the Geographical System of Herodotus (1800), the Comparative Geography of Western Asia (1831), and important studies on the geography of northern Africa - in introductions to the Travels of Mungo Park and Hornemann - and the currents of the Atlantic and Indian Oceans.