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The following are compilations of translated primary sources. Some are temporarily available online. Use the HathiTrust link in the catalog record and then sign in to HathiTrust (upper right corner) to get temporary full-text access by clicking on check out. The check out is for one hour but will automatically renew if no one else is trying to use the book.
Grey literature is material of a scholarly nature produced outside the usual publication channels such as peer-reviewed journals; it is generally not commercially published (Example). Grey literature can include
Other strategies to help identify grey literature include:
If you're not familiar with the think tank, IGO, NGO, etc., it's useful to review the About Us section of their website and look for other views about the organization in order to place their work in context and better evaluate the authority and credibility of their work.