REMOVE

1. close-up views
2. rock
3. branches (plant components)

WHAT

1. Visual Works (hierarchy n … (2)
2. black-and-white film (2)
3. plants (2)

More 

WHERE

1. New Windsor, Maryland (1)
2. Westminster, Maryland (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Clyfford Still; Still, Cl … (1)
3. Sandra L. Still Campbell; … (1)
4. Still, Clyfford (1)

Less

WHEN

1. 1961 (1)
2. 1969 (1)
3. after 1961 (1)