Unfortunately, there virtually no surviving radio broadcasts from 1920s of any kind. It was not until the mid-1930s that the network has systems in place to archive their broadcasts. It was expensive, and most local radio broadcasts did much less, if any.
You may have seen this at the Library of Congress's website: https://www.loc.gov/item/today-in-history/march-20/
It will give you an idea of some of LOC's relevant holdings.
It's great and inspiring moment in history. I wish you luck with it!
All the best,
Library of Congress
From: Association for Recorded Sound Discussion List <[log in to unmask]> On Behalf Of Sarah Craig
Sent: Friday, November 19, 2021 2:00 PM
To: [log in to unmask]
Subject: [ARSCLIST] Archival about 1925 sled dog relay to Nome to save town from epidemic?
I hope this finds everyone well!
I'm doing a story about the 1925 sled dog relay in the race to deliver antiserum and save the town of Nome, Alaska from a diptheria epidemic.
I know that this was around the time that radio first started making its way around the US -- so I'm looking for news reports of the relay, of the epidemic, or of the resulting tours from the sled dogs and their mushers that were made famous. (Their names were Togo with musher Leonard Seappala or Balto with musher Gunnar Kaasen, might be others I don't know about..).
I'm also looking for any other oral histories or interviews of any survivors of the epidemic or of the mushers themselves or the doctor, Curtis Welch, or anyone else involved. If you have any leads, I would be very thankful!