In historical research, “primary sources” are materials produced during the time of an event, often by those who witnessed or participated in it. These sources aren’t just limited to written documents like newspaper articles or journal entries; they can also include photographs, posters, audio recordings, videos, books, and more. The key is not the type of source, but how it is utilized as evidence for the period it represents.
These are not exhaustive lists of resources, but merely some starting points. For resources not listed here, ask your librarian.
These databases generally contain many collections of primary sources, and are often a bit more interdisciplinary as a result. This can be especially useful when you're not sure of where to start.
Legal research database, with numerous libraries covering congressional publications, law publications, treaties, etc.
While you can find advertisements related to food in some of the other primary source databases (think of anything with newspapers or magazines), some databases are focused solely on advertisements