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OK, I've received a couple of emails telling me that the ISSN is not always included in the DOI - that it depends on the publisher. So, I guess my original question still stands! Stephen From: Graham, Stephen Sent: 05 March 2014 12:25 To: [log in to unmask] Subject: RE: Retrieving ISSN using a DOI Sorry - I've answered my own question. The ISSN is actually contained in the DOI. Didn't realise this! D'oh! Stephen From: Graham, Stephen Sent: 05 March 2014 12:14 To: [log in to unmask] Subject: Retrieving ISSN using a DOI Hi All - is there a service/API that will return the ISSN if I provide the DOI? I was hoping that the Crossref API would do this, but I can't see the ISSN in the JSON it returns. I'm adding a DOI field to our OPAC ILL form, so if the user has the DOI they can use this to populate the form rather than add all the data manually. When the user submits the form I'm querying our openURL resolver API to see if we have access to the article. If we do then the form will alert the user and provide a link. The query to the openURL resolver works better if we have the ISSN, but if the user has used a DOI the ISSN is frustratingly never there. Stephen Stephen Graham Online Information Manager Information Collections and Services University of Hertfordshire, Hatfield. AL10 9AB Tel. 01707 286111 Email [log in to unmask]<mailto:[log in to unmask]>