REMOVE

1. mountains
2. clouds
3. barriers
4. Grand Coulee, Washington
5. 1936

WHAT

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

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WHO

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

WHEN

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