Anonymous [15--]. S Doc 91 55 2. 76. Mapa de los Rios Amazonas, Esequiyo o Dulche y Orinoca y de las Comarcas Adyacentes. Reproducido por la lit. del Instituto Geografico y Estadistico Ano de 1877. Early Spanish Map of Guiana, Reproduced from Lithographic Facsimile of the Manuscript Original in the Spanish Archives, Published by the Spanish Government in Cartes de Indias (Madrid, 187).