REMOVE

1. sky
2. rubbish
3. railroads
4. freight cars
5. children
6. hats
7. utility poles

WHAT

1. Visual Works (hierarchy n … (1)
2. automobiles (1)
3. banks (landforms) (1)
4. black-and-white film (1)
5. boys (1)

More 

WHERE

1. New Windsor, Maryland (1)

WHO

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

More 

WHEN

1. 1969 (1)