What are the three main sources of history?

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Tags

1. #fieldwork
2. #original
3. #types
4. #three
5. #surveys
6. #sources
7. #which
8. #including
9. #poems
10. #diaries
11. #records
12. #research
13. #resources
14. #other
15. #based
16. #written
17. #court
18. #interviews
19. #materials
20. #works
21. #primary