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 - Foster, Bruce PY - 1960 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 6995 DO - 10.6028/NBS.RPT.6995 ER -