REMOVE

1. fences
2. sky
3. 1949
4. 1935
5. 1970-08
6. 1967
7. 1980

WHAT

1. blood (2)
2. blue (5)
3. brown (1)
4. clouds (1)
5. farming (3)
6. farms (1)
7. figures (5)
8. figures, abstract (2)
9. green (1)
10. hands (1)
11. horses (animals) (1)
12. landscapes (representatio … (2)
13. machinery (5)
14. oil paint (4)
15. oil pastels (1)
16. red (2)
17. ships (1)
18. shipyards (1)
19. trains (vehicle groupings … (1)
20. Visual works (hierarchy n … (5)
21. white (1)
22. women (1)
23. workers (4)
24. yellow (5)

Less

WHERE

1. Killam, Alberta, Canada (1)
2. New Windsor, Maryland (1)
3. Pullman, Washington (1)
4. San Francisco, California (1)
5. Yaddo, Saratoga Springs, … (1)

More 

WHO

1. Still, Clyfford (5)

WHEN

1. 1929 (1)
2. 1942 (1)
3. 1968 (1)