REMOVE

1. trucks
2. freight cars
3. houses
4. driveways
5. hats
6. rock

WHAT

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

More 

WHERE

1. Ensenada, Baja California … (1)
2. New York, New York (1)

WHO

1. Diane Still Knox; Diane K … (1)
2. Knox, Diane Still (1)

WHEN

1. 1949 (1)
2. 1958 (1)