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On the Sensations of Tone by Hermann von Helmholtz On The Conservation Of Force And Ice And Glaciers by Hermann von Helmholtz Treatise On Physiological Optics by Hermann von Helmholtz Helmholtz's Treatise on Physiological Optics by Hermann von Helmholtz Science and Culture by Hermann von Helmholtz Ice and Glaciers by Hermann von Helmholtz Ueber das Verhältnis der Naturwissenschaften zur Gesammtheit ... by Hermann von Helmholtz Popular Lectures on Scientific Subjects, Series I & II by Hermann von Helmholtz On the Conservation of Force by Hermann von Helmholtz Beschreibung Eines Augen-Spiegels by Hermann von Helmholtz


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