TY - RPRT TI - Evaluation of refractory qualities of concretes for jet aircraft warm-up, power check, and maintenance aprons : quarterly report AU - Pendergast, W L AU - Tuma, Edward C AU - Clevenger, R A PY - 1954 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 3855 DO - 10.6028/NBS.RPT.3855 ER -