This data submission is link to a user reference guide for the SOLTHERM thermodynamic database maintained by the University of Oregon. The data at this link are not 'data results' from sampling. These data are derived from SOLTHERM as a reference for the user, showing balanced reactions and equilibrium constants log K(T,P) along the liquid-vapor saturation curve only, up to 350 degrees C, for aqueous species and minerals including REE, and gases. These data are more easily read by the user than the those in the SOLTHERM thermodynamic database.