"Substanzmonismus" und/oder "Energetik" : der Briefwechsel von Ernst Haeckel und Wilhelm Ostwald (1910 bis 1918) : zum 100. Jahrestag der Gründung des Deutschen Monistenbundes / Rosemarie Nöthlich ... [and others].

The scientific origins of National Socialism : social Darwinism in Ernst Haeckel and the German Monist League / [Daniel Gasman].

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