Buol, S.W., Hole, F.D., McCracken, R.J., and Southard, R.J.. 1997. Soil Genesis and Classification. Fourth Edition. Iowa State University Press, Ames, Iowa 50014.. xv+527 p.

• wetland
• WoUS
• WSMR
• soil
• Waters of the United States
• WSMR SBE