Concentration of Germanium in the Ash of American Coals: A Progress Report, Issues 272-275
Charles Henry Prior · Dagfin John Cederstrom · Taisia Stadnichenko · Vinton Crews Fishel · P. M. Johnston · Seymour Subitzky
فروردین ۱۹۴۹ · U.S. Department of the Interior, Geological Survey