REMOVE

1. soil
2. machinery
3. freight cars

WHAT

1. black-and-white film (3)
2. close-up views (1)
3. cornstalk (2)
4. cranes (equipment) (2)
5. detail views (1)
6. fields (land) (2)
7. hats (2)
8. hills (2)
9. landscapes (representatio … (2)
10. men (male humans) (2)
11. plants (2)
12. railroads (3)
13. rails (transit system ele … (3)
14. rock (1)
15. rubbish (2)
16. sky (2)
17. tools (2)
18. tractors (agricultural eq … (2)
19. trains (vehicle groupings … (3)
20. trees (2)
21. trucks (2)
22. utility poles (2)
23. Visual Works (hierarchy n … (3)
24. wheels (components) (1)
25. woods (plant communities) (2)
26. workers (2)

WHERE

1. New Windsor, Maryland (3)

WHO

1. Campbell, Sandra L. Still (3)
2. Clyfford Still; Still, Cl … (3)
3. Sandra L. Still Campbell; … (3)
4. Still, Clyfford (3)

More 

WHEN

1. 1969 (3)