DOI Error Message: When the “DOI not found” message appears, this usually means the DOI has not been registered for the article. The DOI issue can be reported at DOI.org or CrossRef.org. CrossRef Support appears on the vendor contact page.
Unable to access JSTOR EBA or ProQuest Ebook Central:
In most cases, when a user see the message that the library does not have access to the ebook from either JSTOR EBA or ProQuest Ebook Central, it means that the e-book is no longer available from the vendor or the ebook is not included in our subscription. The vendor does not send separate files to Ex Libris Content so the collections include ebooks we may not be able to access. Report the ebook to Jessica Hartwigsen, requesting the ebook be removed.
ProQuest Ebook Central Example: Witchcraft and magic in Europe the period of the witch trials / Bengt Anakarloo, Stuart Clark, William Monter. "Availability Sorry, this book is not available.”