APA (7th ed.) Citation

Folger, H. W., & Gray, F. (2013). Geochemistry of soils from the San Rafael Valley, Santa Cruz County, Arizona. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Folger, Helen W., and Floyd Gray. Geochemistry of Soils from the San Rafael Valley, Santa Cruz County, Arizona. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2013.

MLA (9th ed.) Citation

Folger, Helen W., and Floyd Gray. Geochemistry of Soils from the San Rafael Valley, Santa Cruz County, Arizona. U.S. Department of the Interior, U.S. Geological Survey, 2013.