Grey Literature is literature that has not been published or has been published in non-conventional forms. Grey Literature can include health reports, minutes, data-sets, photographic evidence and trials. Grey Literature is very useful to find raw data.
Much Grey Literature can be found through search engines such as Google or by going to specific websites.
The links below offer suggestions for specific institutions which produce Grey Literature.
Trials - Journal which encompasses all aspects of the performance and findings of randomized controlled trials in health
Grey literature: what grey literature is, and useful resources to find this (NHS England 2023)
Africa
Asia
Oceania
Europe