REMOVE

1. railroads
2. trees
3. roads
4. 1920
5. 1945

WHAT

1. exterior views (1)
2. forests (plant communitie … (1)
3. landscapes (representatio … (1)
4. mountains (1)
5. railroad stations (1)

More 

WHERE

1. Lake Louise, Alberta, Can … (1)

WHO

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

WHEN

1. between circa 1929 and ci … (1)