EditorialMap of British Guiana with the source land of the Parima Rio Branco and Orinoco, ..., 19th century British Guyanas map, Fig. 1, after p. 469, 1847, Richard Schombrugk: Reisen in Britisch-Guiana in den Jahren 1840-1844 [...]. Erster Theil. Leipzig: Webe...