@book{30387,
	author = {Huffman, Claude, and Mensik, J. D.,},
	title = {Determination of gold in geologic materials by solvent extraction and atomic-absorption spectrometry,},
	publisher = {[U.S. Govt. Print. Off.]},
	year = {1967.},
	series = {United States. Geological Survey. Circular},
	address = {Washington}
}