REMOVE

1. plants
2. sky
3. roads
4. 1945
5. 1920
6. 1941

WHAT

1. banks (landforms) (1)
2. black-and-white film (1)
3. construction equipment (1)
4. construction sites (1)
5. cranes (equipment) (1)
6. Grand Coulee Dam (dam) (1)
7. hills (1)
8. machinery (1)
9. men (male humans) (1)
10. rock (1)
11. scaffolds (1)
12. soil (1)
13. tools (1)
14. towers (single built work … (1)
15. Visual Works (hierarchy n … (1)
16. wood products (1)
17. workers (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)