The tools you use to find primary sources will be individual to your topic. You can ask questions like where, when, why, how to brainstorm digital collections that may exist for your topic. Keep these especially in mind:
In your secondary sources, use the references in the bibliography to get an idea of where primary sources might exist.
To find primary sources at the CMU library (or Prospector or WorldCat) you can add the word sources to your search.
For example: labor unions AND women AND sources
You can also add "type" words to your search, for primary sources of different types.
For example: suffrage movement AND personal narratives.
Words that describe primary source types include: