TY - RPRT TI - Physical properties data compilations relevant to energy storage : III. engineering properties of single and polycrystalline sodium beta and beta -alumina AU - Miller, G R AU - Paquette, D G PY - 1979 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS NSRDS 61p3 DO - 10.6028/NBS.NSRDS.61p3 ER -