REMOVE

1. trains (vehicle groupings)
2. railroads
3. fields (land)
4. horizon line

WHAT

1. Visual Works (hierarchy n … (1)
2. exterior views (1)
3. fences (1)

More 

WHERE

1. Killam, Alberta, Canada (1)

WHO

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

WHEN

1. 1920 (1)
2. 1945 (1)
3. between circa 1929 and ci … (1)