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Vergleichende Selbstmordstatisktik Europas, nebst einem Abriss der Statistik der Trauungen
Digital Archive of Rare Books [Resources and Historical Collections Office]
Statistisch-anthropologische Untersuchung der Gesetzmässigkeit in den scheinbar willkührlichen menschlichen Handlungen
Digital Archive of Rare Books [Resources and Historical Collections Office]
The evolution of modern money
Digital Archive of Rare Books [Resources and Historical Collections Office]
The fable of the bees
Digital Archive of Rare Books [Resources and Historical Collections Office]