Maybe more info in these. I have Sept 1935 in my library. I also have a copy of the WWJ book.
https://www.americanradiohistory.com/Radex_Master_Page.htm
Martin Foltz
Mission Viejo CA
> Date: Mon, 10 Jun 2019 20:20:39 -0700
> From: Joseph Miller <kj8o.ham@gmail.com>
> To: Mailing list for the International Radio Club of America
> <irca@hard-core-dx.com>
> Subject: Re: [IRCA] Los Angeles radio stations as of May 15, 1922
>
> To Bob: ahhh you aren't that old...
>
> To everyone: I looked them up on Wikipedia and there were two in Palm
> Springs at one time.
>
> 73 de Joe
http://www.hard-core-dx.com/article.php?story=20190614031503321