REMOVE

1. coats (garments)
2. rail transit systems

WHAT

1. New York, New York (1)
2. Visual Works (hierarchy n … (1)
3. baseball caps (1)
4. buildings (structures) (1)

More 

WHO

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

WHEN

1. 1950 (1)
2. 1954 (1)
3. Early 1950s (1)