TY - RPRT TI - Certification of SRM 1879 respirable cristobalite as a quantitative x-ray diffraction SRM AU - Kuchinski, Madeline A AU - Hubbard, Camden R AU - Robbins, Carl PY - 1988 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 88-3742 DO - 10.6028/NBS.IR.88-3742 ER -