TY - RPRT TI - Traceable frequency calibrations : how to use the NBS Frequency Measurement System in the calibration lab AU - Kamas, George AU - Lombardi, Michael A PY - 1988 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS SP 250-29 DO - 10.6028/NBS.SP.250-29 ER -