REMOVE

1. tunnels
2. Alberta, Canada
3. Pacific Northwest
4. 1945

WHAT

1. Visual Works (hierarchy n … (1)
2. exterior views (1)
3. landscapes (representatio … (1)
4. mountains (1)
5. roads (1)

WHO

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

WHEN

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