The original scans for these two advertisements come from the Google.com newspaper archives:
September 23, 1920
and
September 27, 1920
.
Pittsburgh Press
, September 23, 1920, page 13:
September 27, 1920, page 11:
United States Early Radio History
>
Broadcasting After World War One
>
Pioneering News and Entertainment Broadcasts (8ZZ/KDKA)