REMOVE

1. sky
2. fences
3. rivers
4. roads
5. 1936

WHAT

1. Grand Coulee Dam (dam) (2)
2. Visual Works (hierarchy n … (2)
3. banks (landforms) (2)
4. barriers (2)
5. black-and-white film (2)

More 

WHERE

1. Grand Coulee, Washington (2)

WHO

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

WHEN

1. 1937 (2)
2. ca. 1936 - 1937 (2)