Many databases include grey literature in addition to traditional literature, but may not index materials in a way that makes them searchable by a filter. The following databases use filters to limit by content types such as conference proceedings, clinical trials, dissertations, clinical practice guidelines, and government documents. Keep in mind - this is not a comprehensive list, so other databases can still be useful to your search!
Check out the Databases A-Z List to see a full list.
The following resources are not Duquesne-specific, but are openly accessible to the public for help in finding grey literature.