Integrative Biology: Grey Literature

In general, grey literature publications are non-conventional, fugitive, and sometimes ephemeral publications. They may include, but are not limited to the following types of materials: reports (pre-prints, preliminary progress and advanced reports, technical reports, statistical reports, memoranda, state-of-the art reports, market research reports, etc.), theses, conference proceedings, technical specifications and standards, non-commercial translations, bibliographies, technical and commercial documentation, and official documents not published commercially (primarily government reports and documents) (Alberani, 1990).

(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC225438/pdf/mlab00125-0040.pdf)

Science.gov -  Searches over 60 databases and over 2,200 scientific websites to provide users with access to more than 200 million pages of authoritative federal science information including research and development results.

OpenGrey - System for Information on Grey Literature in Europe, provides open access to 700.000 bibliographical references of grey literature (paper) produced in Europe. Examples of grey (gray) literature include technical or research reports, doctoral dissertations, some conference papers.

USA.gov - Online guide for government information and services, including state publications. Search by keyword or topic to locate information at the agency level. Includes A-Z index of U.S. Government agencies.

Google - You can perform a selective search for types of documents by using the phrase site:.gov  or site:.edu

WorldCat - a union catalog that itemizes the collections of 72,000 libraries in 170 countries and territories that participate in the Online Computer Library Center (OCLC) global cooperative. Less useful for locating journal and magazine articles.

Digital Dissertations/ProQuest Disserations and Theses Global -  Can search for theses and dissertations from United States and some worldwide. Full-text available for about 95% of titles. Can narrow search just to university (e.g. Oklahoma State University)