- Diaries
- Letters
- Maps from the era
- Memos/E-mails
- Speeches (both the text of the speech & the giving of the speech)
- Manuscripts
- Autobiographies
- Interviews
- Patents
- Laws, legislation, court rulings
- Newspaper & magazine articles from the era
- News film footage
- Raw data and statistics
- Artifacts: buildings, clothes, jewelry, toys, fossils
- Journal articles reporting original research or an experiment
- Official records of governments, agencies, organizations: meeting minutes, reports, vital records (e.g., Census records)
- Creative works: poetry, novels, drama, music, art, photography, movies, scripts, performances
- Technical reports (i.e., accounts of work done on research projects)
- Other documents describing original scientific research, such as notes and personal papers
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- Books or articles that explain or review research works
- Histories and critical commentaries
- Biographies
- Textbooks
- Encyclopedias
- Dictionaries
- Directories
- Handbooks
- Monographs
- Journal article that summarizes and/or synthesizes the results of other researchers' experiments, studies, and/or data
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