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Thermodex - is invaluable resource allows you to search by property and compound/compound type to locate appropriate print reference materials for finding thermophysical properties. Although call numbers listed are the UT numbers, a quick, title search of Franklin will indicate whether or not Penn holds the volume and, if we do, which library has it. This is probably the best method that exists of identifying a print work, although many of the following indices are also good. Its main emphasis is on print resources, although it does cover key electronic resources, as well.
Arizona State University Index to Physical, Chemical, and Other Property Data -presents a list of standard references for physical and chemical properties. The right section has a list of properties. Clicking on one will bring up a list of sources that include this property. Records in the list include the title and the call number at AZ State. It is fairly navigable, but not as flexible as the Thermodex.
Indiana University CHEMINFO SIRCh Physical Properties - This is a list roughly divided by subject category, of various free and fee sources of physical properties. Some of the links are circuitous and take you to a vendor's sale page, but others (like the links to the two preceding resources) link you directly to the resource itself.
SUNY Buffalo's Materials Properties Locator Database - This easily-searchable resource allows you to input your desired property and the class of material for which you wish to find the property and returns a list of print resources that have been extensively indexed for their properties. The nicest thing about it is that you have the opportunity to search the controlled vocabulary of both the property and compound fields and retrieve all references that contain your selected term.