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References
- ↑ Irwin, William (1972). "Terranes of the Western Paleozoic and Triassic Belt in the Southern Klamath Mountains, California" (PDF). Geological Survey Research: C106. Retrieved 3 July 2014.
- ↑ Massey, Peter; Wilson, Jeanne; Titus, Angela (1 August 2006). California Trails North Coast Region. Adler Publishing. p. 72. ISBN 978-1930193222.
- ↑ Genzoli, Andrew (13 July 1968). "The Hall City Cave Story". The Times Standard. Eureka, California. p. 9. Retrieved 11 May 2019– via newspapers.com.
