TY - RPRT TI - Collaborative reference program for paper : Report no. 50S AU - Powell, R G AU - Randall, E B AU - Horlick, J PY - 1978 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 78-1330 DO - 10.6028/NBS.IR.78-1330 ER -