These collections offer a variety of types of primary sources (documents, photographs, videos, etc) for a wide range of time periods and areas of interest.
These collections are a short list of examples of collections that focus on specialized areas of research. To find a digital collection relevant to your area of research, ask for help from a librarian.
The archives of many famous or influential individuals have been put online. Here is a short list of some examples.
Books and pamphlets written during the era you are researching are also considered primary sources. You can find many print items that have been digitized in the following collections: