Find more by Googling your topic and stick "primary sources" at the end of your search. There are many collections available online for free.
Example: working women factory "primary sources"
You can also Google "primary sources" and LibGuides to find library research guides that have listed links to a variety of primary source collections. Many academic libraries use a tool called LibGuides made by Springshare to create guides, including the one for your class.
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