REMOVE

1. trucks
2. plants
3. tools
4. soil

WHAT

1. Visual Works (hierarchy n … (1)
2. black-and-white film (1)
3. hills (1)
4. lakes (bodies of water) (1)
5. landscapes (representatio … (1)

More 

WHERE

1. Lake Louise, Alberta, Can … (1)

WHO

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

WHEN

1. 1930 (1)
2. circa 1930 July 16 (1)