Oporto (Porto) [cartographic material] / drawn by W.B. Clarke, archt. ; printed [and] engraved by J. Henshall.Jany. 1, 1833."Published under the superintendence of the Society for the Diffusion of Useful Knowledge".Ancillary view: View of Oporto from Torre da Marca.Inset map: The environs of Oporto.cartographic