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Grey literature is literature produced by government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers.
Types of grey literature include:
You can find a full list of grey literature types at http://www.greynet.org/greysourceindex/documenttypes.html.
Note that grey literature has not gone through the peer review process, and, therefore, the quality varies.
For additional information about grey literature and how to locate it, see our Grey Literature Guide.
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