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Many resources will not allow searching by abbreviated journal title. Common abbreviated titles, such as JAMA for the Journal of the American Medical Association, have been added to the catalog and Discovery Search; most abbreviated titles required by citation style guides, such as J. Amer. Chem. Soc., are not searchable in the catalog or databases. You will need to find the full title to look up these citations.
All That JAS is a source for looking up journal title abbreviations. Major sources listed there include the ISI Master Journal List and many discipline-specific journal title lists.