[4], 7 pp. With three facsimile maps from the original manuscript drawn by Pedro Font, 1 of them folding; facsimile of letter from Font. 16x11¾, quarter cloth & boards. 1 of 125 copies printed by D.B. Updike at the Merrymount Press.

Font was chaplain and cartographer to the de Ansa overland journey from northern Mexico to the California coast during the winter of 1775-1776. The maps he drew are exceedingly important in the history of the cartography of the Southwest and California, being the first based on actual observations for much of the region. Cowan p. 216.