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.
An aggregated search across digital collections from libraries, archives, and museums in the United States as well as curated exhibitions and primary source sets developed for classroom use.
Access to unique and historically important digital collections: over two million photographs, documents, letters, artwork, diaries, oral histories, films, advertisements, musical recordings, and more.
A website providing free public access to detailed descriptions of primary source collections (manuscripts, historic photos, etc.) maintained by libraries, archives, and museums throughout California.
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