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2. Metal absorption by Equisetum (horsetail);Cannon;U.S. Geol. Surv. Bull.,1968
3. Gold exploration in northern Saskatchewan by biogeochemical methods;Dunn,1986
4. Biogeochemical Methods of Prospecting for Gold-Ore Deposits;Kovalevskii,1974
5. Biogeochemical Methods of Prospecting for Base Metal Deposits;Kovalevskii,1979