Wiley'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 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.