REMOVE

1. trains (vehicle groupings)
2. hats
3. freight cars
4. roads
5. 1969

WHAT

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

More 

WHERE

1. Westminster, Maryland (2)

WHEN

1. 1965 (2)
2. 1966 (2)
3. ca. 1965 - 1966 (2)