Approx. 115 leaves, typed and manuscript, most on rectos only. Color manuscript map on drafting linen. 37.5x22.5 cm (14½x9"), cloth with leather spine at top, tied with a shoestring, printed & ms. cover label.
Abstract if title of a portion of the Watmough Tract, land bought by James H. Watmough, purser on the USS Portsmouth, from Mariano G. Vallejo in 1847. It was part of the much larger Petaluma Rancho, granted to Vallejo in 1834, and subsequently expanded in 1843.