Pen-&-ink on linen, with hand-coloring. On sheet of architectural linen 34x26 cm. 13¼x10"); attached is document signed by J.R. Hardenburgh, Surveyor General of the United States for the State of California, attesting to its correctness.

Nineteenth century copy of the original diseño of Rancho Las Positas, an 8,880-acre Mexican land grant in present day Alameda County, California given in 1839 by governor Juan Alvarado to Robert Livermore and Jose Noriega. Las Positas means "little watering holes" in Spanish. The rancho included the present day city of Livermore.