REMOVE

1. houses
2. stairs
3. boys
4. bushes
5. mothers
6. automobiles

WHAT

1. Nespelem (1)
2. Visual Works (hierarchy n … (1)
3. black-and-white film (1)
4. buildings (structures) (1)

More 

WHERE

1. Nespelem, Washington (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Still, Clyfford (1)

Less

WHEN

1. 1937 (1)
2. 1938 (1)
3. ca. 1937 - 1938 (1)