TY - RPRT TI - Evaluation of refractory qualities of concretes for jet aircraft warm-up, power check maintenance aprons, and runways AU - Ryan, J V AU - Tuma, E C PY - 1963 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 8041 DO - 10.6028/NBS.RPT.8041 ER -