The original document, work of art, lab report, interview, etc. There has been no evaluation or interpretations of the material. It’s what research is based off of.
Examples:
	- Artifacts (e.g. coins, plant specimens, fossils, furniture, tools, clothing, all from the time under study);
 
	- Audio recordings (e.g. radio programs)
 
	- Diaries;
 
	- Internet communications on email, listservs;
 
	- Interviews (e.g., oral histories, telephone, e-mail);
 
	- Journal articles published in peer-reviewed publications;
 
	- Letters;
 
	- Newspaper articles written at the time;
 
	- Original Documents (i.e. birth certificate, will, marriage license, trial transcript);
 
	- Patents;
 
	- Photographs
 
	- Proceedings of Meetings, conferences and symposia;
 
	- Records of organizations, government agencies (e.g. annual report, treaty, constitution, government document);
 
	- Speeches;
 
	- Survey Research (e.g., market surveys, public opinion polls);
 
	- Video recordings (e.g. television programs);
 
	- Works of art, architecture, literature, and music (e.g., paintings, sculptures, musical scores, buildings, novels, poems).
 
https://lib.guides.umd.edu/researchusingprimarysources