REMOVE

1. hats
2. rock
3. automobiles
4. black-and-white film
5. sky
6. rubbish

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. barriers (1)
4. beards (1)
5. berets (1)

More 

WHERE

1. New Windsor, Maryland (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Sandra L. Still Campbell; … (1)

WHEN

1. 1971 (1)