Grey Literature is "[i]nformation produced on all levels of government, academics, business and industry in electronic and print formats not controlled by commercial publishing i.e. where publishing is not the primary activity of the producing body." (http://greynet.org/)
Grey Literature includes:
- working documents
- pre-prints
- research papers
- statistical documents
- difficult-to-access materials
(http://lanic.utexas.edu/project/laoap/glossary.html)
Some common places to find Grey Literature:
