REMOVE

1. machinery
2. hills
3. soil
4. landscapes (representations)
5. cranes (equipment)
6. rock

WHAT

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

More 

WHERE

1. New Windsor, Maryland (1)

WHEN

1. 1967 (1)