TY - RPRT TI - Standard Reference Materials : Micro-homogeneity studies of NBS standard reference materials, NBS research materials, and other related samples/ AU - Heinrich, K F J AU - Marinenko, R B PY - 1979 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 260-65 DO - 10.6028/NBS.SP.260-65 ER -