REMOVE

1. trees
2. sky
3. cliffs
4. rock

WHAT

1. buildings (structures) (1)
2. coastlines (1)
3. exterior views (1)
4. landscapes (representatio … (1)
5. silver gelatin (1)
6. waterfalls (natural bodie … (1)

WHERE

1. 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)