REMOVE

1. hats
2. farms
3. trees
4. windows
5. freight cars

WHAT

1. banks (landforms) (1)
2. construction sites (1)
3. cranes (equipment) (1)
4. dams (hydraulic structure … (1)
5. exterior views (1)
6. Grand Coulee Dam (dam) (1)
7. landscapes (representatio … (1)
8. men (male humans) (1)
9. rock (1)
10. scaffolds (1)
11. silver gelatin (1)
12. sky (1)
13. tools (1)
14. towers (single built work … (1)
15. trucks (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. circa 1936 to 1937 (1)