TY - RPRT TI - The Role of standard reference materials in measurement systems AU - Cali, J P AU - Mears, T W AU - Michaelis, R E AU - Reed, W P AU - Seward, R W AU - Stanley, C L AU - Yolken, H T PY - 1975 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS MONO 148 DO - 10.6028/NBS.MONO.148 ER -