Finding a study done in a particular place is not as easy as it "ought to be", but it is possible!
Note: the same system works in Medline, too.
You'd think you could just type in "African American" and be fine, right? It's not that simple, but it can be done!
Note: If you use other databases, like Medline or PsycInfo, be sure to check the subject terms because they don't all use the same terms in the same way.