Grey literature is information produced outside of traditional publishing, such as government documents, reports, working papers, urban plans, etc. This information is often produced by organizations "on the ground" (such as NGOs and IGOs) where dissemination of information and reporting on activities is the goal before publishing an academic article or book.
If you wish to conduct a Google Custom Search, use the Google search tips here: google_tips_handout.pdf.
- IGO Search
Google Custom Search of IGO websites for reports and other publications.
- NGO Search
Custom Google Search of NGO websites for reports and other publications
- Google Scholar
Searches scholarly literature across disciplines and sources and includes some grey literature.