@book{226964,
	author = {Vepraskas, M. J. and Sprecher, S. W.},
	title = {Aquic Conditions and Hydric Soils: The Problem Soils / M. J. Vepraskas; S. W. Sprecher (ed.)},
	publisher = {Soil Science Society of America},
	year = {1997},
	address = {Madison},
	note = {SSSA Special Publication 50.}
}