REMOVE

1. trees
2. barriers
3. construction equipment
4. roads
5. atmospheric perspective
6. paths

WHAT

1. Grand Coulee Dam (dam) (1)
2. Visual Works (hierarchy n … (1)
3. banks (landforms) (1)

More 

WHERE

1. Grand Coulee, Washington (1)

WHO

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

WHEN

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