@book{21946,
	author = {Moore, H. J. and United States},
	title = {Physical properties of the surface materials at the Viking landing sites on Mars},
	publisher = {U.S. G.P.O.},
	year = {1987.},
	series = {U.S. Geological Survey professional paper},
	address = {Washington},
	note = {"A summary of the results of the Physical Properties Investigation of Viking Lander 1 and 2 during the Viking 1975 project."}
}