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D'OCAGNE, Maurice. *Treatise on Nomography: A General Study of the Graphical Representation of Equations with Any Number of Variables and Their Practical Applications*, 2nd edition, completely revised …, Paris (Guthier-Villars), 1921. Large 8vo, printed paper cover (tears with missing sections, discolored spine), pp. xxiv + 484 with 182 figures in the text or on separate plates, and one fold-out. Calculus Simplified by Mechanical and Graphical Methods: A General Outline, 3rd edition, 1928. Course in Geometry … Paris 1930, in-40, set of 3 vols. Hans Bolza’s bookplate in all three volumes. Provenance: library of Hans and Oscar Bolza, then passed down through the family.
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