in your google search, did you come across this page: http://dbaral.net/RalphBagley/index.html
A sample of paintings seems to be from a family website related to Ralph Bagley. http://dbaral.net/bahai.html
You can do a comparison yourself.
I doubt anyone here would really be be able to give you an answer.
The History Center you already contacted will be your best bet.
It appears Ralph Bagley signed his name 'Ralph L Bagley'.
Also look at his treatment of water, clouds and perspective in this one http://dbaral.net/RalphBagley/slides/RL%20Bagley04.html.
Completely different to your samples.
To me, in all honesty I don't think they are the same artist. I guess they could be earlier works but the color in your samples shows no fading, so they look to me to be quite recently painted. But as I said, the most likely people to tell you will be the History Center. Good luck and let us know how you get on.