[Some problems in establishing the permissible densities of surface contamination by beryllium].
D000336:Aerosols; D001608:Beryllium / Q000592:standards*; D004785:Environmental Pollutants / Q000592:standards*; D008452:Maximum Allowable Concentration; D055585:Physical Phenomena; D010825:Physics; D000644:Quaternary Ammonium Compounds / Q000592:standards
D000336:Aerosols; D004785:Environmental Pollutants; D000644:Quaternary Ammonium Compounds; D001608:Beryllium
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