You might try here:
http://mediaresources.lronhubbard.org/chronicle/page04.htm
I believe PBS became NEA (National Educational Network) for a while and
those PBS stations may have some archives with these things too.
http://www.nea.org/

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On 7/12/2020 7:36 AM, Dave Radlauer wrote:
> L. Ron Hubbard on
> the subject of Dianetics in December 1950.