"Anything that has been created by a person who witnessed or experienced an event as a contemporary would be a primary source. Examples of primary sources would include letters, diaries, autobiographies, and contemporary documents such as newspaper articles, government documents, and oral histories." --Tim Watts
These databases are good starting points for primary source materials.
We have many more databases with primary source materials. Find them by using the "Primary" tag on our databases page. Each database includes a description so you can decide if the material is relevant to your research.
These databases cover a diversity of publications and time periods and are typically digitized copies of documents, so that you can see them in as close to their original form as possible.
These databases include primary sources like: