REMOVE

1. railroads
2. roads
3. buildings (structures)
4. rock
5. sunlight
6. sky

WHAT

1. banks (landforms) (1)
2. black-and-white film (1)
3. construction equipment (1)
4. construction sites (1)
5. cranes (equipment) (1)
6. exterior views (1)
7. Grand Coulee Dam (dam) (1)
8. hills (1)
9. machinery (1)
10. mountains (1)
11. rails (transit system ele … (1)
12. scaffolds (1)
13. shadows (1)
14. sheds (storage structures … (1)
15. soil (1)
16. towers (single built work … (1)
17. Visual Works (hierarchy n … (1)
18. wood products (1)

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)