For a full list of the library's primary source databases, see:
Before online databases, print indexes were the way that scholars discovered what articles and essays were written on a topic. While many things have been moved to databases, many news, magazine, and other popular sources from the early to mid-Twentieth Century, which could make great primary sources for topics in that era, are unlikely to be digitized. The way to discover these sources is still through print indexes.
The indexes are shelved together on the Second Floor of Beeghly Library.