REMOVE

1. machinery
2. hills
3. soil
4. landscapes (representations)
5. rock
6. bushes

WHAT

1. banks (landforms) (1)
2. black-and-white film (1)
3. buildings (structures) (1)
4. construction equipment (1)
5. construction sites (1)
6. cranes (equipment) (1)
7. exterior views (1)
8. Grand Coulee Dam (dam) (1)
9. mountains (1)
10. railroads (1)
11. rails (transit system ele … (1)
12. rivers (1)
13. rubbish (1)
14. scaffolds (1)
15. sheds (storage structures … (1)
16. signs (declatory or adver … (1)
17. sky (1)
18. towers (single built work … (1)
19. trees (1)
20. trucks (1)
21. Visual Works (hierarchy n … (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)