Submit an ISSN to this service, and it returns a list of related ISSNs and selected metadata. ISSNs are related in two different ways: different editions of same serial (such as print and online editions) and historical relationships (ISSN changes that result from title changes, mergers, splits, etc.).
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100 requests per day
REST, OpenURL, unAPI
XML, JSON, CSV, TEXT, Python, PHP, Ruby, and HTML
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