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Grey Literature

Grey Literature may be searched on behalf of the client. Please contact your library to find out more. Below is a sample of grey literature resources – some links may contain both published works and grey literature.

General Repositories

INTL GreySource Index
INTL OALsterOpen (archives initiative)
INTL OpenDOAR
INTL OpenGrey

OPHLA Programmable Searches

Note: Programmable Search engines may return fewer results than regular Google searches. Each search includes refinements (tabs) which display results from less than 20 sites to help mitigate this issue. Please conduct a general Google search and site-specific searches in addition to the Programmable Searches below to maximize retrieval.

Search Ontario Public Health Unit Websites
Search Canadian Health Agency Websites
Search US State Government Websites
Search Select International Public Health Websites

Grey Appraisal Tools

CAN PHO Guide to Appraising Grey Literature
INTL AACODS Checklist

Note: grey literature composed in a common review format may appraised using the appropriate tool for that review type (i.e., CASP Checklists)


For additional resources and searching tips, please see Training.

Grey Literature is defined as "...information produced on all levels of government, academia, business and industry in electronic and print formats not controlled by commercial publishing, i.e. where publishing is not the primary activity of the producing body." 1

1 ICGL Luxembourg, 1997; Expanded in New York, 2004