REMOVE

1. rivers
2. mountains
3. paths
4. construction sites
5. soil

WHAT

1. banks (landforms) (1)
2. barriers (1)
3. black-and-white film (1)
4. bridges (built works) (1)
5. buildings (structures) (1)
6. construction equipment (1)
7. cranes (equipment) (1)
8. fences (1)
9. Grand Coulee Dam (dam) (1)
10. hills (1)
11. landscapes (representatio … (1)
12. machinery (1)
13. roads (1)
14. rock (1)
15. rubbish (1)
16. scaffolds (1)
17. sheds (storage structures … (1)
18. sky (1)
19. valleys (landforms) (1)
20. Visual Works (hierarchy n … (1)
21. 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)