REMOVE

1. maroon
2. green
3. trees
4. 1973
5. 1971

WHAT

1. black-and-white film (1)
2. close-up views (1)
3. detail views (1)
4. freight cars (1)
5. ladders (1)
6. railroads (1)
7. rock (1)
8. rubbish (1)
9. sky (1)
10. soil (1)
11. trains (vehicle groupings … (1)
12. Visual Works (hierarchy n … (1)
13. wrecks (sites) (1)

Less

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)