Web-Based Spectra Resources available to University of Chicago users (some are free, some are paid subscriptions)
SpecInfo collection from Chemical Concepts/Wiley Interscience (restricted to UChicago)
Spectral Information in Chemistry Databases (restricted to UChicago)
SciFinder - References and/or spectra images of NMR, IR, Raman, MS, UV/VIS may be included in the "Experimental Properties" portion of the CAS Registry record for the substance
Beilstein - References to literature reports of NMR, IR, MS, Raman, UV/VIS and other spectral data are often included in the compound record
Sigma-Aldrich "Catalog" (from the list of results, click on the name of the compound, then on the catalog number or CAS RN to see the full record; spectra links (if available are in the box to the right of the main entry under "Related Information") NMR, IR, Raman and MS may be available