REMOVE

1. soil
2. fences
3. trees
4. roads

WHAT

1. Visual works (hierarchy n … (2)
2. blue (2)
3. brown (2)
4. farming (2)
5. figures (2)

More 

WHERE

1. Killam, Alberta, Canada (1)
2. Pullman, Washington (1)

WHO

1. Still, Clyfford (2)

WHEN

1. 1929 (1)
2. 1935 (1)