REMOVE

1. hats
2. rubbish
3. automobiles
4. sky
5. driveways
6. buildings (structures)
7. shades (coverings)

WHAT

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

More 

WHERE

1. New Windsor, Maryland (1)
2. Spokane, Washington (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Nelson, Erna Bert (1)
3. Sandra L. Still Campbell; … (1)

WHEN

1. 1941 (1)
2. 1969 (1)