Wiley&#39;s broad and field-tested spectral libraries have millions of spectra available, across various applications and techniques including mass spec (MS), infrared (IR), Raman, NMR, and UV-Vis. At the helm of this is The Wiley Registry&reg; of Mass Spectral Data, the largest mass spectral library commercially available. The Wiley Registry provides researchers the most assurance that their untargeted spectral search is the broadest available.