@book{30540,
	author = {VanSickle, Gordon H., and Lakin, Hubert William,},
	title = {An atomic-absorption method for the determination of gold in large samples of geologic materials,},
	publisher = {[U.S. Govt. Print. Off.]},
	year = {1968.},
	series = {United States. Geological Survey. Circular},
	address = {Washington}
}