TY - RPRT TI - Report no. 10 : a metallurgical evaluation of two AAR M128 steel car head plates used in switchyard impact tests AU - Early, J G AU - Interrante, C G PY - 1980 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 80-2039 DO - 10.6028/NBS.IR.80-2039 ER -