1. Report on the lands of the arid region of the United States: With a more detailed account of the lands of Utah. With maps;Powell,1879
2. Factors of soil formation: A system of quantitative pedology;Hans,1941
3. Pedology and digital soil mapping (DSM);Ma;European Journal of Soil Science,2019
4. Wooton, EO. The Range problem in New Mexico. Albuquerque Morning Journal, Albuquerque, New Mexico, USA. NM College of Agriculture and Mechanic Arts Agriculture Experiment Station Bulletin No. 66. 1908.
5. The Guy Smith interviews: Rationale for concepts in soil taxonomy. Vol. 11;Smith,1986