Answered By: Hannah DiMeglio Last Updated: Feb 04, 2021 Views: 2
This will depend on what kind of historical document it is. Here are some ideas, but it's best to Ask a Librarian if you have a specific thing you're looking for.
US Government documents: search Google for the title or keyword and add "" to the end of the search (ex. constitution of the united states )
Important historical figures: search Google for the person's name in quotes and add "archive" or "collection" or "papers" (ex. Rachel Carson collection)