TY - RPRT TI - Evaluation of refractory qualities of concretes for jet aircraft warm-up, power check maintenance aprons, and runways : final report AU - Ryan, James V PY - 1966 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 9415 DO - 10.6028/NBS.RPT.9415 ER -