REMOVE

1. trees
2. farms
3. wheels (components)
4. Campbell, Sandra L. Still

WHAT

1. Visual Works (hierarchy n … (1)
2. barns (1)
3. black-and-white film (1)
4. buildings (structures) (1)
5. cornstalk (1)

More 

WHERE

1. New Windsor, Maryland (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Sandra L. Still Campbell; … (1)
3. Still, Clyfford (1)

WHEN

1. 1969 (1)