REMOVE

1. trains (vehicle groupings)
2. studies
3. automobiles
4. landscapes (representations)
5. farming

WHAT

1. Visual Works (hierarchy n … (1)
2. sketches (1)

WHO

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

WHEN

1. 1923 (1)
2. 1936 (1)
3. circa 1929 (1)