There are several places you can search online for the full texts of classical works and for newspapers and other early American documents. If the site offers an "advanced search" option, you can save time by entering the author in an "author" or "creator" search line. Search for images in the art databases such as ArtStor and Art Full Text. Many articles about specific topics will also have images accompanying the text.
Primary sources are crucial in history papers! Primary sources are documents that were created at or near the time of the events being studied.