REMOVE

1. black-and-white film
2. railroads
3. water tanks

WHAT

1. banks (landforms) (1)
2. bushes (1)
3. exterior views (1)
4. freight cars (1)
5. hills (1)
6. ladders (1)
7. landscapes (representatio … (2)
8. machinery (1)
9. men (male humans) (1)
10. plants (1)
11. rails (transit system ele … (1)
12. rock (1)
13. sheds (storage structures … (2)
14. soil (1)
15. trains (vehicle groupings … (1)
16. trees (1)
17. utility poles (1)
18. Visual Works (hierarchy n … (2)
19. workers (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Still, Clyfford (1)

WHEN

1. 1920 (2)
2. 1940 (2)
3. between 1920 - 1940 (2)