The National Institute of Standards and Technology's (NIST's) ThermoLit database indexes the literature references from NIST SOURCE data archive on thermophysical properties of chemical substances and systems. Users select the system type (pure compound, binary mixture or ternary mixture), then select the compound(s) of interest, then the property group (e.g. critical properties, density properties), then the specific property. The search generates a list of references which contain the relevant data. Note that this database does not display the data values nor does it link to the source material.