REMOVE

1. hills
2. atmospheric perspective
3. barriers
4. mountains
5. landscapes (representations)
6. 1937

WHAT

1. Visual Works (hierarchy n … (1)
2. armchairs (1)
3. artists (visual artists) (1)
4. beards (1)
5. black-and-white film (1)

More 

WHO

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

WHEN

1. 1969 (1)