TY - RPRT TI - The crystal structures of gaylussite, CaNa2(CO3) sub 2 . 5H2O and pirssonite, CaNa sub 2(CO3) sub 2 . 2H2O : progress report AU - Dickens, Brian AU - Brown, Walter E PY - 1968 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 9921 DO - 10.6028/NBS.RPT.9921 ER -