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 - Clevenger, R A AU - Tuma, Edward C PY - 1953 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 3012 DO - 10.6028/NBS.RPT.3012 ER -