The INFOTHERM® database, produced by FIZ CHEMIE Berlin, has now been linked into records in ChemSpider.
The database provides experimental thermodynamic and physical properties of 33,000 mixtures and 9,000 pure substances from a total of 12,000 compounds. In ChemSpider if you search for a compound and look under the Phys. Properties tab in the Associated Data Source Info box, you will find a link to a record in INFOTHERM.
Clicking on the ID link will take you to records in INFOTHERM for that compound where you can look at the various thermodynamic properties available and make a selection of which property is of interest. By clicking on the button for Full access you can view the experimental data and find a link to the bibliographic reference.