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Hentschel, Klaus.
Die Korrespondenz Petzoldt--Reichenbach : zur Entwicklung der "wissenschaftlichen Philosophie" in Berlin / Klaus Hentschel.
Reichenbach, Hans, 1891-1953
Petzoldt, Joseph, 1862-1929 -- Correspondence.
Science -- Philosophy.
Relativity (Physics) -- Philosophy.
Relativity (Physics) -- History.
Feigl, Herbert.
Petzoldt, Joseph, 1862-1929.
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