1. Terceira and Graciosa, Azores Maps University Of Minnesota Public content 1873. Vidal, A. T. E. (Alexander Thomas Emeric), 1792-1863. Large corrections Mar. 73.; Relief shown by hachures, soundings, and spot heights.; Includes 6 cross sections and 6 insets: Caldeira of Graciosa --... Hydrographic Office (London).