ISSN & ISBN lookup tools
ISSN & ISBN search tools
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ISSN PORTAL — worldwide database of ISSN bibliographic records
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ISBN Search — unofficial search engine, but provides more data (and is less obnoxious) than the alternatives I’ve seen so far
ISSN PORTAL — worldwide database of ISSN bibliographic records
ISBN Search — unofficial search engine, but provides more data (and is less obnoxious) than the alternatives I’ve seen so far