TY - RPRT TI - Circular of the Bureau of Standards no. 539 volume 5: standard x-ray diffraction powder patterns AU - Swanson, Howard E AU - Ugrinic, George M PY - 1955 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS CIRC 539v5 DO - 10.6028/NBS.CIRC.539v5 ER -