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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
Grey literature can be harder to identify and find because it often isn't formally published or indexed in the databases used to find scholarly literature.
Some specialized databases may include some grey literature; for example
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.