REMOVE

1. sidewalks
2. automobiles
3. plants
4. buildings (structures)
5. houses

WHAT

1. black-and-white film (1)
2. branches (plant component … (1)
3. bushes (1)
4. coats (garments) (1)
5. color film (film) (1)
6. drinking fountains (1)
7. driveways (1)
8. exterior views (2)
9. freight cars (1)
10. hats (1)
11. lamps (lighting devices) (2)
12. men (male humans) (1)
13. neighborhoods (2)
14. parking lots (1)
15. public sculpture (1)
16. purses (ladies' accessori … (1)
17. railroads (1)
18. rails (transit system ele … (1)
19. roads (1)
20. rock (1)
21. rubbish (1)
22. signs (declatory or adver … (1)
23. sky (2)
24. soil (1)
25. streets (1)
26. trains (vehicle groupings … (1)
27. trees (2)
28. trucks (1)
29. utility poles (1)
30. Visual Works (hierarchy n … (2)
31. wheels (components) (1)
32. women (1)
33. workers (1)

WHERE

1. New Windsor, Maryland (2)

WHO

1. Campbell, Sandra L. Still (1)
2. Clyfford Still; Still, Cl … (1)
3. Sandra L. Still Campbell; … (1)
4. Still, Clyfford (1)

More 

WHEN

1. 1966 (1)
2. 1969 (1)
3. after 1966 (1)