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1.	PDF 3643_etd Effectiveness of dental masks and an industrial mask to filter aerodynamically respirable dust particles created by grinding dental composite adh[...] Vest, Devan 2009 \| Thesis \| Detailed record - Similar records
2.	Gas mask A World War II-era German gas mask, picked up by Capt. John R. Richardson, M.C., in the sector of the Franco-German border under General Pattons command. The mask was lat [...] 1940 \| Still image \| Historical Collections and Archives \| Detailed record - Similar records

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