Title leaf, pp. 155-253 pp. Printed on one side only. Folding map. (Folio) 37x30.5 cm (14½x12"), original printed wrappers. First Edition.
The voyages of Ulloa, Vizcaino, Drake, and others are analyzed and compared. Issued by the United States Coast and Geodetic Survey, F.M. Thorn Superintendent.
The folding map is "Landfalls of Cabrillo and Ferrelo on the Pacific Coast from the Gulf of California to latitude 42º 30' by George Davidson." It measures 53.5x46 cm.