TY - RPRT TI - Standard Reference Materials : Metallographic characterization of an NBS spectrometric low-alloy steel standard/ AU - Yakowitz, H AU - Michaelis, R E PY - 1964 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 260-3 DO - 10.6028/NBS.SP.260-3 ER -