Identity an old sedan, not Model A

[Vern]

I have been trying to ID the old sedan in the photos.
In the summer of 1939 my mother and 4 girlfriends went on a road trip from Springfield, Illinois to the 1939 fair in San Francisco. They went all over the western part of the US, including Mt. Rushmore, Yellowstone, Crater Lake and
down to Los Angeles after the fair. Then back to Springfield.
I recently came across photos, postcards and letters from their trip.
I regret never having asked her about their adventures.
Anyhow, can one of you car enthusiasts help determine what the car was?