REMOVE

1. rock
2. trains (vehicle groupings)
3. sidewalks
4. rubbish
5. buildings (structures)

WHAT

1. automobiles (1)
2. black-and-white film (1)
3. coats (garments) (1)
4. driveways (1)
5. exterior views (1)
6. freight cars (1)
7. hats (1)
8. houses (1)
9. lamps (lighting devices) (1)
10. men (male humans) (1)
11. neighborhoods (1)
12. parking lots (1)
13. plants (1)
14. purses (ladies' accessori … (1)
15. railroads (1)
16. rails (transit system ele … (1)
17. roads (1)
18. signs (declatory or adver … (1)
19. sky (1)
20. soil (1)
21. trees (1)
22. trucks (1)
23. utility poles (1)
24. Visual Works (hierarchy n … (1)
25. wheels (components) (1)
26. women (1)
27. workers (1)

WHERE

1. New Windsor, Maryland (1)

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. 1969 (1)