- National archives
- State archives
- Local archives
- University archives
- Church archives
- Business archives
- Family archives
* Libraries:
- National libraries
- State libraries
- Local libraries
- University libraries
- Special libraries
- Historical libraries
* Museums:
- National museums
- State museums
- Local museums
- University museums
- Historical museums
- Specialized museums
* Historical Societies:
- National historical societies
- State historical societies
- Local historical societies
- Regional historical societies
* Private Collections:
- Individuals
- Families
- Businesses
- Organizations
* Online Databases:
- Government databases
- Library databases
- Museum databases
- Historical society databases
- Private databases
