Analysis of information sources in references of the Wikipedia article "The Pickwick Corporation" in English language version.
The Pickwick Broadcasting KTM 780
This is a review of the 87 AM radio stations that have operated in the greater Los Angeles area between 1921 and 1998.
By 1935, KTM had become KEHE, named after the Los Angeles Evening Herald Newspaper and was the Los Angeles station for Hearst Radio Inc, part of the Hearst media empire.
QSL letter to a DXer in New Jersey from KTM-780 in Los Angeles that shows they were on the air at 3:00 a.m. in February of 1931