REMOVE

1. plants
2. garages
3. sky
4. clouds
5. fields (land)

WHAT

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

More 

WHO

1. Campbell, Sandra L. Still (1)
2. Sandra L. Still Campbell; … (1)

WHEN

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