Luzin, N. Integral Calculus (Integral'noe ischislenie). 1961. In Russian.

Лузин, Николай Николаевич. Интегральное исчисление / допущено Министерством высшего и среднего специального образования СССР в качестве учебного пособия для вузов.
Москва : Государственное издательство "Высшая школа", 1961. 416 страниц ; 22 см.
Твердый переплет. Тираж 50 000 экземпляров.
Переплет хорошее: небольшой скол на задней сторонке. Блок очень хорошее: крепкий, страницы чистые, текст полный.
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Luzin, Nikolai Nikolaevich. Integral Calculus / approved by the USSR Ministry of Higher and Secondary Specialized Education as a textbook for institutions of higher education.
Moscow : Vysshaya Shkola State Publishing House, 1961. 416 pp. ; 22 cm.
Hardcover. Print run of 50,000 copies.
Binding good: small chip to the rear board. Text block very good: firm, leaves clean, text complete.

The seventh edition of the standard Soviet university textbook on integral calculus by Nikolai Nikolaevich Luzin (1883-1950), founder of the Moscow school of function theory, whose students, known collectively as "Luzitania," included Pavel Alexandrov, Andrei Kolmogorov, and Mikhail Suslin, and who remains one of the central figures in twentieth-century descriptive set theory and real analysis. Luzin was posthumously honored through the continued republication of his textbook pair "Differentsial'noe ischislenie" and "Integral'noe ischislenie," which together formed the standard calculus sequence for Soviet mathematics and physics students across multiple decades following his death in 1950; the present volume, prepared for its seventh printing under the editorship of S. I. Novoselov, reflects that enduring institutional status. Distinctively for a Soviet-era calculus text, Luzin's exposition is notably discursive and philosophically attentive to foundational subtleties, such as the distinction between a genuine variable and a merely nominal index of summation, a style that set his books apart from the more terse formalism typical of contemporary Western calculus manuals and made them valued as much for their pedagogical clarity as for their rigor. Luzin's own career had been shadowed by the notorious 1936 political campaign against him within the Soviet Academy of Sciences, the so-called "Luzin affair," from which he emerged professionally diminished but which did not prevent his textbooks from becoming, and remaining, foundational texts of Soviet mathematical education.