TY - RPRT TI - Evaluation of refractory qualities of concretes for jet aircraft warm-up, power check maintenance aprons, and runways : quarterly report AU - Pendergast, W L AU - Tuma, E C AU - Ward, D K PY - 1961 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 7351 DO - 10.6028/NBS.RPT.7351 ER -