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2016-08-15. Chronic, Halka (1983). Roadside Geology of Arizona. p. 85. ISBN 9780878421473. "Boundary Cone". Geographic Names Information System. United States...3 KB (254 words) - 21:56, 20 February 2024
229–232. (US 89A Marble Canyon – Fredonia), pp. 179–180. (softcover, ISBN 978-0878421473) Lucchitta, 2001. Hiking Arizona's Geology, Ivo Lucchitta, c 2001, Mountaineers's...9 KB (798 words) - 17:06, 10 January 2022
229–32 (US 89A Marble Canyon – Fredonia), pp. 179–180. (softcover, ISBN 978-0878421473) Lucchitta, 2001. Hiking Arizona's Geology, Ivo Lucchitta, 2001, Mountaineers's...13 KB (1,392 words) - 03:24, 29 November 2022
Mountain Press Publishing Co., 1983, 23rd printing, pp. 229–232, ISBN 978-0878421473 Lucchitta, Ivo, Hiking Arizona's Geology, 2001, Mountaineers's Books...16 KB (1,976 words) - 01:07, 12 June 2024
of Arizona. Missoula: Mountain Press Pub. Co. pp. 209, 210–212. ISBN 978-0878421473. Dallegge, Todd A.; Ort, Michael H.; McIntosh, William C. (2003). "Mio-Pliocene...14 KB (1,354 words) - 11:56, 27 September 2023
