REMOVE

1. sky
2. trucks
3. tipis
4. plants
5. bridges (built works)

WHAT

1. barns (1)
2. black-and-white film (1)
3. buildings (structures) (1)
4. cornstalk (1)
5. exterior views (1)
6. farms (1)
7. fields (land) (1)
8. forests (plant communitie … (1)
9. freight cars (1)
10. ladders (1)
11. landscapes (representatio … (1)
12. railroads (1)
13. rails (transit system ele … (1)
14. rubbish (1)
15. soil (1)
16. trains (vehicle groupings … (1)
17. trees (1)
18. utility poles (1)
19. Visual Works (hierarchy n … (1)
20. wheels (components) (1)
21. wrecks (sites) (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)