REMOVE

1. groves (plant communities)
2. automobiles
3. fields (land)
4. 1960
5. 1970

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. black-and-white film (1)
4. branches (plant component … (1)

More 

WHEN

1. between 1960 - 1970 (1)