REMOVE

1. farms
2. trees
3. ladders
4. black-and-white film
5. rubbish
6. barns

WHAT

1. buildings (structures) (1)
2. cornstalk (1)
3. exterior views (1)
4. fields (land) (1)
5. forests (plant communitie … (1)
6. freight cars (1)
7. landscapes (representatio … (1)
8. plants (1)
9. railroads (1)
10. rails (transit system ele … (1)
11. sky (1)
12. soil (1)
13. trains (vehicle groupings … (1)
14. trucks (1)
15. utility poles (1)
16. Visual Works (hierarchy n … (1)
17. wheels (components) (1)
18. 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)