@book{191437,
	author = {Gray, John E. and Geological Survey (U.S.)  },
	title = {Geologic studies of mercury by the U.S. Geological Survey},
	publisher = {U.S. Geological Survey},
	year = {2003.},
	series = {U.S. Geological Survey circular},
	address = {Reston, Va.},
	note = {Shipping list no.: 2004-0055-P.}
}