TY - RPRT TI - Performance test of an Owens-Corning "Dust-Stop" Type C" air filter AU - Coblentz, Carl W AU - Achenbach, Paul R PY - 1961 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 7331 DO - 10.6028/NBS.RPT.7331 ER -