REMOVE

1. fences
2. barriers
3. mountains
4. cranes (equipment)
5. atmospheric perspective
6. rivers

WHAT

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

More 

WHERE

1. Westminster, Maryland (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Still, Clyfford (1)

WHEN

1. 1966 (1)
2. ca. 1966 (1)