Ed, Recently I was given a June 28, 1934 Springfield (MA) Union
Newspaper. It has a Radio News and Programs section. The two Springfield
stations were WBZA 990 and WMAS 1420. Also listed were Hartford
WTIC 1040 and WDRC 1330, New York City WEAF 660, WJZ 760, WABC 860,
Schenectady WGY 790 and Newark WOR 710. With your extensive historical
knowledge you probably know all the older frequencies but I figured
I'd include them on the theory you can never have enough sources.
For what it's worth here are the days' listings for WDRC for June