REMOVE

1. bridges (built works)
2. trees
3. water
4. 1945

WHAT

1. exterior views (1)
2. lakes (bodies of water) (1)
3. landscapes (representatio … (1)
4. reflections (perceived pr … (1)

More 

WHERE

1. Alberta, Canada (1)

WHO

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

WHEN

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