Relief shown by hachures. Includes "View of Oporto from Torre da Marca." Inset: The environs of Oporto (scale [ca. 1:80,000]). "Published under the superintendence of the Society for the Diffusion of Useful Knowledge." "195." Charles Knight produced books and maps for the Society for the Diffusion of Useful Knowledge from 1844-1846. cf. Tooley's dictionary of mapmakers.