REMOVE

1. rock
2. rubbish
3. railroads
4. automobiles
5. bushes
6. roads
7. boys

WHAT

1. banks (landforms) (1)
2. black-and-white film (1)
3. branches (plant component … (1)
4. brick (clay product) (1)
5. buildings (structures) (1)
6. children (1)
7. exterior views (1)
8. fields (land) (1)
9. forests (plant communitie … (1)
10. freight cars (1)
11. garages (1)
12. hills (1)
13. landscapes (representatio … (1)
14. men (male humans) (1)
15. plants (1)
16. rails (transit system ele … (1)
17. signs (declatory or adver … (1)
18. sky (1)
19. soil (1)
20. trains (vehicle groupings … (1)
21. trees (1)
22. utility poles (1)
23. Visual Works (hierarchy n … (1)
24. wheels (components) (1)
25. windows (1)
26. 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)