Grey literature is any information that is not produced by commercial publishers. It includes research reports, working papers, conference proceedings, theses, preprints, white papers, and reports produced by government departments, academics, business and industry.
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MU Research Archive Library (MURAL)
World Cat the collections of more than 10,000 libraries worldwide
Copac a merged online catalogue of major libraries in the UK and Ireland
LENUS (HSE Health Repository)
OpenGray (Grey Literature in Europe)
ROAR (Registry of Open Access Repositories)