TY - RPRT TI - Evaluation of refractory qualities of concretes for jet aircraft warm-up, power check maintenance aprons, and runways : quarterly report AU - Ryan, J V AU - Tuma, E C PY - 1964 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 8189 DO - 10.6028/NBS.RPT.8189 ER -