REMOVE

1. buildings (structures)
2. farmhouses
3. bushes
4. yards (areas)
5. rubbish
6. black-and-white film

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)

More 

WHERE

1. Westminster, Maryland (1)

WHEN

1. 1961 (1)
2. after 1961 (1)