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The definition commonly used to describe grey literature comes from the Fourth International Conference on Grey Literature in Washington, DC (October, 1999):
"That which is produced on all levels of government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers."
Learn more from the New York Academy of Medicine, Grey Literature Report: http://www.greylit.org/about
Types of Grey Literature
Census, economic and other data sources | Conference proceedings and abstracts | Databases of ongoing research; registered clinical trials |
Electronic networks (Listserv archives, etc.) | Informal communications (phone conversations, email, meetings, etc.) | Newsletters, trade journals |
Preprints of e-journal articles | White papers | Research reports (completed and uncompleted) |
Technical reports | Theses and Dissertations | Web log (blog); government websites & documents |
Where to find it?
Professional Organization Websites (Does your working group have a professional organization? A union? Do they have anything to say about work-related injuries? A policy paper, newsletter article, fact sheet, training manual, etc. can be considered grey literature.)
Government Websites (Almost everything from the government is grey literature! Think about resources from the CDC/NIOSH, DOL, laws, data from the Census, etc.)