REMOVE

1. railroads
2. freight cars
3. plants
4. buildings (structures)
5. colleges (buildings)
6. children

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. berets (1)
4. birds (animals) (1)
5. black-and-white film (1)

More 

WHERE

1. 48 Cooper Square, New Yor … (1)

WHO

1. Garske, Patricia; Patrici … (1)
2. Still, Patricia (1)

WHEN

1. 1952 (1)
2. ca. 1952 (1)