REMOVE

1. rubbish
2. automobiles
3. railroads
4. boys
5. trains (vehicle groupings)

WHAT

1. atmospheric perspective (1)
2. banks (landforms) (1)
3. barriers (1)
4. black-and-white film (1)
5. bridges (built works) (1)
6. buildings (structures) (1)
7. clouds (1)
8. construction equipment (1)
9. construction sites (1)
10. cranes (equipment) (1)
11. fences (1)
12. Grand Coulee Dam (dam) (1)
13. hills (1)
14. houses (1)
15. landscapes (representatio … (1)
16. machinery (1)
17. mountains (1)
18. paths (1)
19. rivers (1)
20. roads (1)
21. rock (1)
22. scaffolds (1)
23. sheds (storage structures … (1)
24. sky (1)
25. towers (single built work … (1)
26. townscapes (representatio … (1)
27. trees (1)
28. utility poles (1)
29. valleys (landforms) (1)
30. Visual Works (hierarchy n … (1)
31. 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)