TY - RPRT TI - Preliminary report on the thermodynamic properties of selected light-element and some related compounds : the previous semiannual reports in this series have the NBS report nos. 6297, 6484, 6645, 6928, 7093, 7192, 7437, 7587, 7796, 8033, 8186, 8504, 8628, 8919, 9028, 9389, 9500, 9601 PY - 1968 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 9803 DO - 10.6028/NBS.RPT.9803 ER -