Prehistoric use of coal by Indians of northern Arizona Author J. O. Brew and J. T. Hack Article Date July 1939 Journal Title Plateau
Hopi political economy: industrialization and alienation Author R.Clemmer Article Date Winter 1977 Journal Title Sw Econ & Soc
Forest litter as a seed source in coal mine reclamation in the Southwest Author A. Day & K. Ludeke Article Date 1990 Article Abstract Applications of forest litter and supplemental irrigation may insure successful establishment of vegetation on areas disturbed by open-pit coal mining. Journal Title Desert Plants