REMOVE

1. barriers
2. rubbish
3. windows
4. demolition (process)

WHAT

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

More 

WHERE

1. Westminster, Maryland (1)

WHEN

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