REMOVE

1. ladders
2. trees
3. houses
4. sky

WHAT

1. black-and-white film (1)
2. branches (plant component … (1)
3. exterior views (1)
4. freight cars (1)
5. plants (1)
6. railroads (1)
7. rails (transit system ele … (1)
8. roads (1)
9. scaffolds (1)
10. signs (declatory or adver … (1)
11. soil (1)
12. trains (vehicle groupings … (1)
13. Visual Works (hierarchy n … (1)
14. wheels (components) (1)
15. windows (1)
16. 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)