@book{52642,
	author = {Harkness, William,},
	title = {Observations on terrestrial magnetism and on the deviations of the compasses of the United States iron clad Monadnock},
	publisher = {Smithsonian Institution,},
	year = {1873]},
	series = {Smithsonian contributions to knowledge. [vol. XVIII, art. 4]},
	address = {[Washington,}
}