TY - RPRT TI - Performance characteristics of four models of "Dri-Pak" deep-bed air filters AU - Coblentz, Carl W AU - Achenbach, Paul R PY - 1963 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 8001 DO - 10.6028/NBS.RPT.8001 ER -