1. Spectrochemical Analysis;Ahrens,1950
2. Quantitative Spectrochemical Analysis of Silicates;Ahrens,1955
3. Tabulation of geochemical data furnished by 109 laboratories for six geochemical exploration reference samples;Allcott;U.S. Geol. Surv., Open-File Rep. 78-163,1978
4. Portable x-ray spectrograph in geochemical exploration;Barton,1980
5. Elemental associations in mineral deposits and indicator elements of interest in geochemical prospecting (revised);Boyle;Geol. Surv. Can., Paper 74-75,1974