Help! Records needed on Upper Silesia in the 1920s

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A quick call for assistance on behalf of someone who has been in touch recently.

Does anyone know of any records /interviews /transcripts /letters / diaries, etc., that relate to Jews, Poles and Germans, and interactions among them, in Upper Silesia, please? The dates needed are from the end of the First World War until about 1923. It doesn’t matter what language they are in.

If so, it would be great to hear from you. You can reach me on the usual contact page.

Many thanks!