@book{195243,
	author = {Harden, Stephen L. and Spruill, T. B. and North Carolina},
	title = {Ionic composition and nitrate in drainage water from fields fertilized with different nitrogen sources, Middle Swamp watershed, North Carolina, August 2000-August 2001},
	publisher = {U.S. Geological Survey},
	year = {2004.},
	address = {[Reston, Vir.]},
	note = {Shipping list no.: 2004-511-M.}
}