See also Stern’s autobiographie <a href"https://wiener.soutron.net/Portal/Default/en-GB/RecordView/Index/689">Warum hassen sie uns eigentlich?.
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Heinemann Stern (1878-1957) was a German teacher and board member of several Jewish organisations including the Centralverein deutscher Staatsbürger jüdischen Glaubens (C.V.) where he had become acquainted with Alfred Wiener. He fled to Brazil in 1940. See Walk, J., <a href"http://wiener.soutron.net/Portal/Default/en-GB/RecordView/Index/1957">Kurzbiographien zur Geschichte der Juden 1918-1945, Munich et.al., K. G. Saur, 1988, p. 354.
44 letters
Correspondence mainly with Alfed Wiener on various subjects including: their shared early years in Berlin working for the C.V. Zeitung; life in Brazil; an essay by Stern"Jews and New Christians in Brazi"; and Stern's autobiography. Mentioned is also correspondence between Stern and former pupils of his describing their life as emigres.
Correspondence with Stern, Heinemann