The ARL has been gathering data since the early 1960’s in the form of IR, NMR, and MS spectral data, as well as total ion chromatograms. Over 8000 IR and FTIR spectra have been run at the ARL. The ARL has also amassed a collection of about 15,000 mass spectra of organic compounds isolated and identified from archaeological contexts and from natural sources in this and other laboratories. In addition, we retain an archive of reference mass spectra from primary and secondary sources for these compounds.