REMOVE

1. buildings (structures)
2. circa 1930–36

WHAT

1. Visual works (hierarchy n … (2)
2. factories (structures) (2)
3. graphite pencils (2)
4. smoke (2)

WHERE

1. Pullman, Washington (2)

WHO

1. Still, Clyfford (2)

WHEN

1. 1930 (2)
2. 1936 (2)