REMOVE

1. trees
2. sky
3. clouds
4. rivers
5. 1978
6. 1912
7. 1933

WHAT

1. Visual Works (hierarchy n … (2)
2. black-and-white film (2)
3. buildings (structures) (2)
4. coats (garments) (2)
5. hats (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)