@book{166551,
	author = {Powars, David S. and Bruce, T. Scott},
	title = {The effects of the Chesapeake Bay impact crater on the geological framework and correlation of hydrogeologic units of the Lower York-James Peninsula, Virginia},
	publisher = {U.S. Geological Survey},
	year = {1999.},
	series = {U.S. Geological Survey professional paper},
	address = {Madison, WI.}
}