Primary sources of information are those that provide first-hand accounts of the events, practices, or conditions you are researching. In general, these are documents that were created by the witnesses or first recorders of these events at about the time they occurred, and include diaries, letters, reports, photographs, creative works, financial records, memos, and newspaper articles (to name just a few types).
Primary sources also include first-hand accounts that were documented later, such as autobiographies, memoirs, and oral histories. However, the most useful primary sources are usually considered to be those that were created closest to the time period you’re researching.
Source: Primary Source Village (https://www.library.illinois.edu/village/primarysource/mod1/pg1.htm)
News, business, and legal publications (including U.S. Supreme Court decisions dating back to 1790), company information, and patents. (Full-Text)
News, business, and legal publications (including U.S. Supreme Court decisions dating back to 1790), company information, and patents. (Full-Text)
News, business, and legal publications (including U.S. Supreme Court decisions dating back to 1790), company information, and patents. (Full-Text)