There is also a youtube video "1939 Cleveland National Air Races (Clip 06)" that has footage of them flying around.
The film colour is a bit compromised, however the variety of schemes is fascinating...most are ochre, white, green(?) and applied in a typical camo pattern, however at least one has stripes of camo! Some other aircraft seem to only have dark green, olive green and light grey in their camo.
The camo also seems to be wrap around (includes undersides) in many (all?) cases.
Juanita