REMOVE

1. stairs
2. plants
3. trees
4. branches (plant components)
5. after 1961

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. baseball (field sport) (1)
4. beards (1)
5. black-and-white film (1)

More 

WHO

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

WHEN

1. 1971 (1)