Society for the Diffusion of Useful Knowledge ; engraved by J. & C. Walker.Relief shown by hachures.Colored in outline.Marocco sheet includes Inset: Plan of the city of Marocco (Scale ca. 1:32,000) and Algier sheet includes inset Continuation of Algier (Scale ca. 1:2,000,000).Some sheets with sources in lower margin.