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HEINKE, C. Introduction to Electrical Engineering, Leipzig 1909. KEUNEN, J.P. The Equation of State for Gases and Liquids and the Theory of Continuity, Braunschweig 1907. TOLLE, Max. The Control of Power Machines, Berlin 1909. JOCHMANN, E. Outline of Experimental Physics …, Berlin 1906. Inscription by Hans Bolza in the first three volumes. Provenance: library of Hans and Oscar BOLZA, then passed down through the family.
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