Typically research that is unpublished or published outside of traditional academic journal circuits.
Examples include:
Government reports
Conference proceedings
Theses
Preliminary progress reports
Geological and geophysical surveys
Newsletters and bulletins
Search tips for finding gray literature:
Search the websites of corporations, institutions, or agencies that produce the kinds of literature you're looking for
Try a site:gov search in Google
For example, if you're looking for government reports about the Arctic National Wildlife Refuge, type Arctic National Wildlife Refuge Report:gov, as this will instruct Google to search for only domain names ending in .gov
Scholar Commons is an institutional repository to preserve, collect and disseminate the research and scholarship of the University of South Carolina. Contributions from authors include articles and books, documents, technical reports, presentations, conference proceedings, creative activities, master's theses, open-access dissertations and more.
Access reports on the Automated Fluid Minerals, Forest Resources, Mineral & Land, or Rangeland Administration. Each report will note if the areas included are public and/or indigenous.
Contains research products primarily from EPA's Office of Research and Development. Science Inventory records provide descriptions of the product, contact information, and links to available printed material or websites.
By searching the NOAA website, you will find budgets, reports, posts, and data on various projects run by NOAA. For a more focused search, try the EIS database.
DOE reports are found through the Office of Scientific and Technical Information database. Access documents as far back as 1940 and filter by document type.
Lists U.S. federal agency announcements and information, such as presidential documents, agency meetings, grant opportunities, and proposed and final federal regulations.
Provides access to legislative, executive and judicial documents and publications, and current and historical documents databases from the Government Printing Office.
Over 50,000 treaties and international agreements including information on the status of over 500 major multilateral treaties. Subject matter includes human rights, disarmament, commodities, refugees and the environment.
A scientific agency of the United States government, the USGS studies the landscape of the United States. USGS conducts research in the following disciplines: biology, geography, geology, and hydrology.
The center for polar science and polar operations, addressing global issues and impacts of a changing climate. Access data, research papers, news and images.
Includes geoscientific information about mineral resources and mineral potential in the province. Access maps, publications, and geologic survey data of the rock and mineral resources of British Columbia.