Topic
- Steel industry and trade 38
- Railroads 35
- American poetry--20th century 34
- Poets, American--20th century 34
- Art--Collectors and collecting 33
- Industrial equipment 32
- Railroad rails 32
- Students --Italy --Pictorial works 31
- Abandoned buildings 30
- Mills and mill-work 30
- Buildings 29
- Photography of farms 29
- Portrait photography 28
- Abandonment of property 27
- African American political activists 27
- Demonstrations --Italy --Pictorial works 27
- Doors & doorways 27
- Black Power 26
- Black militant organizations 26
- Landscape photography 26