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M
Clifton, H. E., Arthur Hubert, and R. L. Phillips. Marine Sediment Sample Preparation for Analysis for Low Concentrations of Fine Detrital Gold In U. S. Geological Survey Circular. Vol. 545. Department of the Interior, 1967.
P
Johnson, Maureen G.. Placer Gold Deposits of Nevada In U. S. Geological Survey Bulletin. Vol. 1356. Department of the Interior, 1973.
S
Clifton, H. E., R. E. Hunter, F. J. Swanson, and R. L. Phillips. Sample Size and Meaningful Gold Analysis In U. S. Geological Survey Professional Paper. Vol. 625-C. Department of the Interior, 1969.