REMOVE

1. tunnels
2. roads
3. exterior views
4. 1945

WHAT

1. Visual Works (hierarchy n … (1)
2. landscapes (representatio … (1)
3. mountains (1)

WHERE

1. Alberta, Canada (1)
2. Pacific Northwest (1)

WHO

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

WHEN

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