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Affenproblem. Titelseite von Arnold Bra Publikation Das AffenProblem Professor Haeckel Darstellungs und Kampfesweise sachl dargelegt en Title page of Arnold Bra Das AffenProblem Professor Haeckel's Darstellungs und Kampfesweise sachl dargelegt The book was written by member of the Keplerbund christian organisation that fought monism