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Many libraries, museums, and archives have some or all of their collections digitized and available online. Using Google Advanced Search can help you locate primary source collections available online.
Type in your topic in the "All these words" search box
Type in library, archive, and museum in the "Any of these words" search box
Then limit your search to a specific domain; libraries, archives, and museums typically have a .edu or .org address. Some government museums and archives use .gov.
Remember, anyone can publish anything online! Make sure you take a critical look at any websites you are considering using for your research!