1. J. Black (1973 ) Galapagos Archipielago del Ecuador, 138 pp. Fundacion Charles Darwin para las Islas Galapagos, Quito, Ecuador.
2. Defense Mapping Agency Hydrographic/Topographic Center (DMA). (1943 ) 5923, Gardner Bay, Espanola. Washington, D.C. 20315.
3. DMA. (1943 ) 5924, Isla Santa Maria: Post Office Bay. Washington, D.C. 20315.