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EULER, Leonhard. *Opera omnia* (Series I: *Opera mathematica*), vols. XI, XII. *Institutiones calculi integralis* (edited by Friedrich Engel & Ludwig Schlesinger). Leipzig & Berlin (B. G. Teubner) 1913–14. In-4°, printed publisher’s cardboard binding, spine faded, some wear, 2 vols., pp. xviii + 461; [xvi] + 542. Volume two contains Leonhard Euler, *Institutiones calculi integralis*, vol. ii, 1–416 Laurentius Mascheronii, *Adnotationes ad calculum integralem Euleri*, 417–488 Adnotationes ad calculum integralem Euleri, pars altera, 489–542 Provenance: library of Hans and Oscar BOLZA, then passed down through the family.
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