REMOVE

1. rivers
2. bushes
3. trees
4. construction equipment
5. buildings (structures)

WHAT

1. banks (landforms) (1)
2. black-and-white film (1)
3. construction sites (1)
4. cranes (equipment) (1)
5. exterior views (1)
6. Grand Coulee Dam (dam) (1)
7. hills (1)
8. landscapes (representatio … (1)
9. machinery (1)
10. mountains (1)
11. railroads (1)
12. rails (transit system ele … (1)
13. rock (1)
14. rubbish (1)
15. scaffolds (1)
16. sheds (storage structures … (1)
17. signs (declatory or adver … (1)
18. sky (1)
19. soil (1)
20. towers (single built work … (1)
21. trucks (1)
22. 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)