@book{30478,
	author = {Geological Survey (U.S.) and Sainsbury, C. L.},
	title = {Cassiterite in gold placers at Humboldt Creek Serpentine-Kougarok area, Seward Peninsula, Alaska /},
	publisher = {[U.S. Govt. Print. Off.],},
	year = {1968.},
	series = {Circular,},
	address = {Washington :}
}