Subject
- Periodicals40
- Economic policy38
- Raw materials37
- Shipment of goods35
- International trade34
- Slave ships32
- Standardization32
- Merchants29
- Environmental aspects28
- Industrial statistics28
- Product safety28
- Purchasing27
- Slave traders27
- Social aspects27
- Technological innovations27
- Produce trade26
- Terminology and classification26
- Commercial statistics25
- Consumer education25
- Government purchasing25