- Weapons industry--United States32
- Yale Association of Japan Collection32
- Authors, English--18th century28
- Contract labor--Canada27
- Contracts--Canada--19th century27
- Fur trade--Canada27
- Fur trade--North America27
- Fur traders--Canada27
- Fur traders--United States27
- Trading posts--Canada27
- Trading posts--North America27
- Indians of North America--Legal status, laws, etc.26
- Painters--United States--20th Century--Archives26
- Authors, American--20th century--Archives25
- Islamic binding24
- Authors, American--20th century23
- Christian literature, Latin (Medieval and modern)23
- Lawyers--United States23
- Scholasticism22
- Scholia22