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As far as I can tell in English only. If I knew of an earlier Polish published version I would have included it, and it would have been likely to have been mentioned at least on zbMATH where I would have seen it (I did look at the Neumer review there despite it being in German). One of the reviews talks about it being written as a draft in Polish and then translated (with the delay caused by the translation as a reason for some recent results being omitted). I didn't see any information about who did the translation or whether it might have been Sierpiński himself. His earlier book Leçons sur les nombres tranfinis on similar topics seems to have been published only in French. —David Eppstein (talk) 06:18, 31 August 2020 (UTC)Reply