Ruth Ann, thank you SO MUCH for your thorough answer! I'm grateful for all the info, and somebody in the future will love finding this!
Alas, this is not "my" Arthur M. Baker.
I'm attaching a copy of Etta Mae Baker's death certificate. One of those sad old stories: "Burns of entire body" - "Starting a fire in a cook stove with coal oil"
Again, thanks! And good rooting to all!