REMOVE

1. farms
2. houses
3. clouds
4. buildings (structures)
5. landscapes (representations)

WHAT

1. Visual Works (hierarchy n … (1)
2. banks (landforms) (1)
3. barns (1)
4. black-and-white film (1)

More 

WHERE

1. Maryland (1)

WHEN

1. 1961 (1)
2. after 1961 (1)