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- Idem, Superintendent's Monthly Report, June 1929, 9; Superintendent's Monthly Report, July 1929, 7.
- "Wawona Road Information," Motorists' hand-out, 9 June 1930. Copy attached to Thomson, Superintendent's Monthly Report, June 1929.
- Thomson, Superintendent's Monthly Report, August 1929, 8; Superintendent's Monthly Report, September 1929, 7; Superintendent's Monthly Report, October 1929, 9; Tolen, Final Construction Report, Grading of Wawona Road, Eleven Mile-Grouse Creek (1928-29), 26 February 1930, 2.
- Thomson, Superintendent's Monthly Report, November 1929, 6, 11, 23; Superintendent's Monthly Report, April 1930; Superintendent's Monthly Report, April 1931, 14; Tolen, Final Construction Report, Camp Hoyle-Alder Creek, 2; T. M. Roach, Final Construction Report, Wawona Road Grading, Grouse Creek-Turtleback Dome, 17 February 1932, 3.
- Thomson, Superintendent's Monthly Report, July 1930, 8; Roach, Final Construction Report, Grouse Creek-Turtleback Dome, 3, 6.
- Location Survey Report, Turtleback Dome-Valley Floor, 2, 4.
- Thomson, Superintendent's Monthly Report, July 1930, 8; Superintendent's Monthly Report, September 1930, 9; Superintendent's Monthly Report, May 1931, 11; H. S. Booth, Final Construction Report, Grading, Camp Hoyle-Mariposa Grove Road, 28 March 1932, 2-3; Tolen, Final Construction Report, Grading, Eleven Mile-Grouse Creek, 3.
- National Park Service press release, Wawona Road Reconstruction, September 1930.
- Project Completion Report #60, Clearing of Wawona Road, April 1931. Yosemite National Park Maintenance and Engineering offices.
- Tolen, Final Construction Report, Grading, Camp Hoyle-Alder Creek, 4-5, 21.
- Greene, II:814; Thomson, Superintendent's Monthly Report, April 1931, 14.
- Robert Charles Pavlik, "In Harmony with the Landscape: A History of the Built Environment of Yosemite National Park, 1915-1940" (Master's Thesis, University of California at Santa 8arbara, December 1986), 98.
- Final Completion Report, S. F. Merced Bridge, Yosemite Project 2-82, 1 April 1932, 1-4, 10; Thomson, Superintendent's Monthly Report, October 1931, 8.
- Johnston, 45-46.
- Wawona Tunnel National Register nomination, Sec. 8, p. 2. N.B.: The original Inspiration Point was about a mile further east, and was the point from which the Mariposa Battalion first looked into Yosemite Valley.
- Alfred Runte, Yosemite: The Embattled Wilderness (Lincoln: University of Nebraska Press, 1990), 170-71.