REMOVE

1. soil
2. rock
3. roads
4. driveways
5. 1923

WHAT

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

Less

WHERE

1. Killam, Alberta, Canada (2)

WHO

1. Still, Clyfford (2)

WHEN

1. 1930 (2)