REMOVE

1. landscapes (representations)
2. houses
3. trees
4. clouds
5. utility poles
6. Maryland

WHAT

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

More 

WHEN

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