REMOVE

1. children
2. machinery
3. 1931
4. 1933

WHAT

1. farming (2)
2. farms (2)
3. figures (2)
4. graphite (2)
5. horses (animals) (2)
6. plows (agricultural equip … (2)
7. Visual works (hierarchy n … (2)
8. workers (2)

WHERE

1. Killam, Alberta, Canada (2)

WHO

1. Still, Clyfford (2)

WHEN

1. 1930 (2)