Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
What is grey literature?
"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." (from the Fourth International Conference on Grey Literature: New Frontiers in Grey Literature.GreyNet, Grey Literature Network Service. Washington D.C. USA, 4-5 October 1999.)
A summary of the various document types which constitute gray literature is available from GreyNet, an organization dedicated to tracking gray literature.
Grey Literature in the Health Sciences
Created by University of Pennsylvania's Library, this guide presents an overview, tips and sources for locating unpublished (aka "grey") literature," in the health sciences.
Grey Literature Report
Alerts readers to new grey literature publications in health services research and selected public health topics.
Mednar is a free, publicly available deep web search engine that uses advanced "federated search technology" to return high quality results by submitting your search query - in real-time - to other well respected search engines then collating, ranking and dropping duplicates of the results.
National Technical Information Service (NTIS)
Index of technical reports of U.S. and international government agencies. The full-text link in the database does not go to the full-text of the report but many reports are available by searching the BLC WorldCat catalog, government websites, or Google.
OpenGrey is a multidisciplinary European database, covering science, technology, biomedical science, economics, social science and humanities. The information is all in English and covers technical or research reports, doctoral dissertations, conference papers, official publications, and other types of grey literature.
Science.gov searches over 38 databases and 1,950 selected websites, offering 200 million pages of authoritative U.S. government science information, including research and development results.
A global science gateway—accelerating scientific discovery and progress through a multilateral partnership to enable federated searching of national and international scientific databases and portals. You can conduct keyword searches in your native language.