A goldmine for sure. Found this. Who knew that there was James Brown Radio in Baltimore! The Derb knew what he was doing!
I was looking more at the old radio magazines from the 1920's thru 1979.
Next to the last selection box on the top labeled Early Radio,
when you run your mouse over it, it changes to magazines and features.
Then the first dropdown box is Hobbyist and Construction. The drop down
from that show all the magazines they have. They are mostly 100% in PDF.
Lots of cool construction articles on transmitters and receivers and even mods
for some of the older amateur stuff. Was kinda cool seeing Heathkit adds for
the new DX100 and advertisements trying to stoke up interest in the new
807 tubes..