Topic
- Laboratories20
- African American choirs17
- Street vendors17
- Smoking16
- Horses15
- Carriages and carts14
- African Americans13
- Cities and towns--Pictorial works13
- Gardens13
- Artists12
- Astronomers12
- Astronomical instruments12
- Wagons12
- Theaters11
- High school students10
- Physical education and training10
- Refracting telescopes10
- Art museums9
- Biointensive gardening9
- Drama9