1. The homogeneity of six geochemical exploration reference samples;Allcott,1974
2. Sample size and meaningful gold analysis;Clifton;U.S. Geol. Surv., Prof. Pap. 625-C,1969
3. Descriptions and analysis of eight new USGS Rock Standards;Flanagan;U.S. Geol. Surv. Prof. Pap. 840,1976
4. Determination of gold in geologic materials by solvent extraction and atomic-absorption spectrometry;Claude;U.S. Geol. Surv. Circ.,1967
5. Introduction to Exploration Geochemistry;Levinson,1974