REMOVE

1. sky
2. railroads
3. wheels (components)
4. rubbish
5. utility poles

WHAT

1. automobiles (3)
2. banks (landforms) (3)
3. barns (1)
4. black-and-white film (5)
5. boys (2)
6. branches (plant component … (2)
7. brick (clay product) (2)
8. buildings (structures) (4)
9. bushes (3)
10. children (2)
11. coats (garments) (3)
12. cornstalk (1)
13. driveways (1)
14. exterior views (4)
15. farms (1)
16. fields (land) (3)
17. forests (plant communitie … (3)
18. freight cars (5)
19. garages (2)
20. hats (3)
21. hills (2)
22. houses (1)
23. ladders (2)
24. lamps (lighting devices) (1)
25. landscapes (representatio … (2)
26. men (male humans) (4)
27. neighborhoods (1)
28. parking lots (1)
29. pipes (smoking equipment) (1)
30. plants (5)
31. purses (ladies' accessori … (1)
32. rails (transit system ele … (5)
33. roads (3)
34. rock (2)
35. sidewalks (1)
36. signs (declatory or adver … (3)
37. soil (5)
38. trains (vehicle groupings … (5)
39. trees (5)
40. trucks (2)
41. Visual Works (hierarchy n … (5)
42. windows (2)
43. women (1)
44. workers (4)
45. wrecks (sites) (3)

WHERE

1. New Windsor, Maryland (5)

WHO

1. Campbell, Sandra L. Still (5)
2. Clyfford Still; Still, Cl … (5)
3. Sandra L. Still Campbell; … (5)
4. Still, Clyfford (5)

More 

WHEN

1. 1969 (5)