REMOVE

1. paths
2. roads
3. fences
4. cranes (equipment)
5. barriers
6. artists (visual artists)

WHAT

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

More 

WHERE

1. New Windsor, Maryland (1)

WHEN

1. 1966 (1)
2. after 1966 (1)