REMOVE

1. freight cars
2. railroads
3. coastlines
4. exterior views
5. colleges (buildings)

WHAT

1. Greenwich, Connecticut (1)
2. Visual Works (hierarchy n … (1)
3. artists (visual artists) (1)
4. black-and-white film (1)
5. doors (1)

More 

WHERE

1. Greenwich, Connecticut (1)

WHEN

1. 1956 (1)
2. 1956 April 11 (1)