Volcanic bombs Author N. Leatham Article Date February 17, 1963 Article Abstract Volcanic bombs scattered along the Gila near Sentinel Journal Title Ariz Days & Ways
Remanent magnetization of lava flows in northern Arizona Author N.D. Opdyke and S.K. Runcorn Article Date July 1956 Journal Title Plateau
Down the tubes Author P. Perry Article Date June 1975 Article Abstract Lava tubes west of Flagstaff Journal Title Outdoor Ariz