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- Park Engineer's Report, 30 September 1914, in Report of the Acting Superintendent of the Yosemite National Park to the Secretary of the Interior, 1914. (Washington: Government Printing Office, 1915), 18.
- Report of the Director of the National Park Service to the Secretary of the Interior, 1917, (Washington: Government Printing Office, 1917), 844; Greene, II:543.
- Quoted in Meyer, 27-29.
- W. B. Lewis, Superintendent's Monthly Report, March 1924, 8.
- Idem, Superintendent's Monthly Report, May 1925, 14; E. P. Leavitt, Acting Superintendent' 5 Monthly Report, September 1925, 10; Lewis, Superintendent's Monthly Report, October 1925, 6; O. G. Taylor, Acting Superintendent's Monthly Report, October 1926, 3; Leavitt, Acting Superintendent's Monthly Report, November 1926, 6.
- Leavitt, Superintendent's Monthly Report, July 1927, 2; Acting Superintendent's Monthly Report, October 1927.
- "Information on the Construction of the Wawona Road, Based on Statements from Mr. Henry S. Tolen," typed MSS, 5 April 1948, 2-3. Yosemite Research Library collection.
- Johnston, 45.
- Ibid.; National Register of Historic Places nomination for the Wawona Tunnel, prepared by Linda Wedel Greene, March 1989, Sec. 7, p. 3; Bureau of Public Roads, Location Survey Route for the Wawona Road, Camp Hoyle-Turtleback Dome, 22 March 1932, 1-2; Idem, Location Survey Route for the Wawona Road, Camp Turtleback Dome-Valley Floor, 14 April 1932, 2, 3-4.
- F. A. Kittredge, NPS Chief Engineer, to Dr. F. E. Mathes, U.S. Coast and Geodetic Survey, 3 April 1929, Yosemite Research Library; "Information on the Wawona Tunnel," 4.
- Leavitt, Acting Superintendent's Monthly Report, June 1928, 4; Acting Superintendent's Monthly Report, July 1930, 5.
- Completion Report 60, Clearing of Wawona Road, April 1931. Yosemite National Park Maintenance and Engineering Office.
- Leavitt, Acting Superintendent's Monthly Report, August 1928, 3; Bureau of Public Roads, Location Survey Report on the Wawona Road, Camp Hoyle to Turtleback Dome, 22 March 1932, 2; Henry S. Tolen, Final Construction Report, Wawona Road, Grading, Camp Hoyle-Alder Creek, 26 February 1930, 2.
- Leavitt, Acting Superintendent's Monthly Report, October 1928, 1, 5.
- Idem, Acting Superintendent's Monthly Report, November 1928, 4; Henry S. Tolen, Bureau of Public Roads, Final Construction Report, Wawona Road, Alder Creek-Eleven Mile Station, n.d., 3-4. Yosemite Research Library.
- Charles Goff Thomson, Superintendent's Monthly Report, April 1929, 6-7; Superintendent's Monthly Report, May 1929, 15, 19.