You may also want to browse for books. Try these call number ranges in Hunt Library:
While the 4th floor of Hunt Library is closed, reference books located in FA-REF-4 can be requested at the library's lending desk on the first floor. Books with other 4th floor locations (STACKS-4, OVRSZQ-4, FOLIOS-4) can be requested through the library catalog. See How to Request a Book [video].
As you use each source, look for citations in bibliographies and footnotes that will lead you to other sources. If you find references to items that Carnegie Mellon does not own they may be requested through Interlibrary Loan if you allow a week or more.