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PDF ISSNs for Magazines and Periodicals
Magazines and Periodicals in PDF format use ISSNs (although occasionally they also have a very generic ISBN that is not issue specific).
To extract ISSN instead of ISBN, use the Library Codes plug-in.
See the attached image.
Obviously, if the PDF is comprised purely of scanned images rather than normal text, then nothing can be done. It is just a series of pictures that only OCR software can deal with.
DaltonST
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