REMOVE

1. men (male humans)
2. plants
3. sky
4. Visual Works (hierarchy name …
5. freight cars
6. pipes (smoking equipment)
7. New Windsor, Maryland
8. Campbell, Sandra L. Still
9. Still, Clyfford

WHAT

1. automobiles (1)
2. banks (landforms) (1)
3. black-and-white film (1)
4. boys (1)

More 

WHO

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

WHEN

1. 1969 (1)