REMOVE

1. rubbish
2. sky
3. soil
4. trees
5. boys
6. blue

WHAT

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

More 

WHERE

1. Westminster, Maryland (1)

WHO

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

WHEN

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