Finding resources in Special Collections may be a little bit different than the kind of searching you do for an average research project. Finding archival collections relevant to your research can be tricky. Some collections are assembled by staff based on similar content, but most are associated with a particular creator -- generally a person or an organization. Don't be afraid of the rabbit holes! You might discover something you weren't expecting.
Does the collection cover the time period in which you're interested?
How much material does the collection comprise?
How is the collection organized?
Libraries, historical societies, and database vendors are digitizing archival materials to make them more accessible. Below are just a few such projects.