Grey Literature (also spelled Gray Literature) is literature that is not available through the usual bibliographic sources such as databases or indexes. It can be both in print and, increasingly, electronic formats. Gray literature is produced by government agencies, universities, corporations, research centers, associations and societies, and professional organizations.
|Fact Sheets||Government Documents||Committee Reports||Newsletters|
|Standards||Technical Documentation||Bulletins||White papers|
|Patents||Technical Reports||Symposia||Working papers|
|Business documents||Conference proceedings||Pre-prints||Unpublished works|
DOE Office of Scientific and Technical Information provides the science, technology, and engineering research information from the US Department of Energy
Jet Propulsion Laboratory provides access to JPL authored, externally published papers and reprints
DTIC --Defense Technical Information Center
NASA Technical Reports Server -- Technical reports from NASA and NACA
TRAIL -- Technical Reports Archive and Image Library provides historic technical reports from a number of federal agencies
OAIster is a catalog of millions of records to open access digital resources.
arxiv.org/ is maintained by Cornell University and contains open access to 1,118,279 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.
Networked Computer Science Technical Reference Library [NCSTRL] contains full-text computer science technical reports mainly from universities and research centers.
The National Agricultural Library -- Agricola --contains agricultural information.