Use all of the following methods to find primary sources.
The internet has enabled anyone to 'publish' material and information. This makes it hazardous for researchers to find reliable information. Primary sources are prevalent on the web, and this makes the historian's work much more efficient, but it is often difficult to discern a web source's reliability. Good strategies for using the web for historical research are:
The HathiTrust repository is a good place to search for primary sources that are available in full text.
JSTOR now contains thousands of images contributed by libraries and other cultural institutions, including images from Artstor. Search JSTOR by keyword, if images contain metadata using your keyword they will display along with journal articles and book chapter results, like this: