TY - RPRT TI - Mechanisms of fire ignition and extinguishment : fifteenth progress report covering the period 1 February to 30 April 1963 AU - Creitz, E C PY - 1963 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 7889 DO - 10.6028/NBS.RPT.7889 ER -