The ₁₃C nuclear magnetic resonance spectra of amber from several mining sites in the Dominican Republic show considerable variation. In certain cases the differences are sufficiently distinct to serve as a reliable indicator of provenance. The gradations within the resonances of unsaturated carbons may reflect the relative ages of the samples, because fossilization and diagenesis can remove this functionality. See also AATA 19-1959 and 22-965 for other work on amber. -- AATA