TY - RPRT TI - Circular of the Bureau of Standards no. 539 volume 3: standard x-ray diffraction powder patterns AU - Swanson, Howard E AU - Ugrinic, George M PY - 1954 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS CIRC 539v3 DO - 10.6028/NBS.CIRC.539v3 ER -