TY - RPRT TI - Standard Reference Materials Secondary ferrite number reference materials gage calibration and assignment of values AU - Siewert, T A AU - Wang, C M AU - McCowan, C N PY - 2000 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 260-141 DO - 10.6028/NIST.SP.260-141 ER -