The library has many books that are either collections of primary sources, or are a mix of primary and secondary sources. One easy way to find these is to go to the library catalog and search for your topic, adding the word "sources" to your search, like this:
Because not all of the library books are properly cataloged with the word "sources," you can also search by the type of document. Try some of these search terms:
You should also be sure to look at these series titles. Search for these using the "Series" button in the library catalog: