REMOVE

1. freight cars
2. black-and-white film
3. portraits
4. bushes

WHAT

1. banks (landforms) (1)
2. coats (garments) (1)
3. hats (1)
4. men (male humans) (1)
5. plants (1)
6. profiles (figures) (1)
7. railroads (1)
8. rails (transit system ele … (1)
9. sky (1)
10. soil (1)
11. tools (1)
12. trains (vehicle groupings … (1)
13. trees (1)
14. utility poles (1)
15. Visual Works (hierarchy n … (1)
16. wheels (components) (1)
17. workers (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)