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According to this biographical note (https://t.co/FtlIYnS2eg), this was due to his sustained correspondence with his former boss Leopold Lichtwitz, who emigrated to the US to escape Nazi prosecution (https://t.co/KCrOMU7rkL).
According to this biographical note (https://t.co/FtlIYnS2eg), this was due to his sustained correspondence with his former boss Leopold Lichtwitz, who emigrated to the US to escape Nazi prosecution (https://t.co/KCrOMU7rkL).