REMOVE

1. flags
2. plants
3. hats

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. sky (1)
13. soil (1)
14. tools (1)
15. towers (single built work … (1)
16. Visual Works (hierarchy n … (1)
17. wood products (1)
18. workers (1)

Less

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)