Underneath the title is a dedication and note by the author: Dedicated to our Most Illustrious Lord Don Pedro Rodriguez Campomanes, Council and Chamber Fiscal, Director of the Royal Academy of History, and Righteous Appreciator of the Arts and Applied Sciences. For Doctor Don Casimiro Ortega, Promoter of this Piece Engraved and Created by Geographer Don Juan de la Cruz Cano y Olmedilla, Pensioner of His Catholic and Academic Majesty in the Kingdom of San Fernando, making use of various recollections and travels, printed as manuscripts, especially those of Sarmiento. 1769. With an explanatory note in the upper left corner on the longitudinal measure and abbreviations. With annotations on the diverse locations of this map. Directions and survey values are indicated. The reference meridians for the longitudinal measures on the map are Tenerife, El Hierro, Paris, and London.