From Charles Wilkes,Narrative of the United States Expedition During the Years 1838, 1839, 1840, 1842. Philidelphia, Lea and Blanchard, 1845. Vol. 5, facing p. 113. Sketched by A.T. Agate, engraved by Rawdon, Wright and Hatch.
(Courtesy Special Collections Division, University of Washington Libraries.)
The Astorian's Land Routes, 1811-1812.
From Dorothy O. Johansen and Charles M. Gates, Empire of the Columbia: A History of the Pacific Northwest. New York, Harper and Brothers, 1957. p. 129. Cartography by John Sherman, University of Washington.
The Astorian Scheme.
from D.W. Meinig, The Great Columbia Plain: A Historical Geography. Seattle, University of Washington Press, 1968. Map 8, p. 49. John Fonda, Cartographer.