- 4
- "Iron Horse" , "Welcome to Washington State Parks". 2006, retrieved 21 April 2006.
- 5
Lange referenced Thomas W. Prosch, "A Chronological History of Seattle From 1850 to 1897," typescript dated 1900-1901, pp. 178-180, Northwest Collection, University of Washington Library, Seattle;
Yvonne Prater, ''Snoqualmie Pass: From Indian Trail to Interstate'' (Seattle: The Mountaineers, 1981), 29-32;
James Oliphant, "Cattle Trade Through Snoqualmie Pass", ''Pacific Northwest Quarterly'' Vol. 38 (July 1947), p. 195.
- 6
MacIntosh referenced King County Landmarks and Heritage Commission.
- Oldham, Kit (18 February 2003). "Robert Newell and Joseph Meek reach Fort Walla Walla with the first wagons driven overland to the Columbia River in September 1840." , HistoryLink.org Essay 5235. Retrieved 21 April 2006. Oldham referenced Clinton A. Snowden, ''History of Washington'' (New York: The Century History Company, 1909), Vol. 2, pp. 5-7, 18, 23-25, 269, 274-75, 280-81.
- Prater, Yvonne (1981). ''Snoqualmie Pass: From Indian Trail to Interstate''. Seattle: The Mountaineers. ISBN 0-89886-015-6.
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