Georg Vega. Logarithmic-Trigonometric Manual (Logarifmicheski-trigonometricheskoye rukovodstvo), 1881. In Russian.

Вега Георг. Логарифмически-тригонометрическое руководство барона Георга Вега. / 61-е изд., вновь пересм. и доп. д-ром К. Бремикером.
Берлин : Вейдманн (Weidmann), 1881.
XXX, 576 с. Твердый владельческий переплет, увеличенный формат.
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Vega, Georg. Baron Georg Vega's Logarithmic-Trigonometric Manual. / 61st edition, again revised and supplemented by Dr. K. Bremiker.
Berlin : Weidmann, 1881.
XXX, 576 pp. Hardcover (owner's binding), enlarged format. In Russian.

This 1881 edition represents the continued legacy of Baron Georg von Vega (1754–1802), a Slovenian-born Austrian mathematician and artillery officer whose logarithmic tables became the gold standard for scientific and engineering calculations for over a century. Published in Berlin by the renowned Weidmann house, this 61st edition was meticulously revised and expanded by the astronomer Dr. Karl Bremiker, ensuring the highest level of accuracy for 19th-century practitioners.
Vega’s primary contribution to mathematics was the perfection of the seven-digit logarithm. His tables provided the essential computational infrastructure for the pre-computer age, allowing astronomers, surveyors, and military engineers to perform complex multiplications and trigonometric calculations with unprecedented speed and precision. The 1881 manual includes common logarithms of numbers, logarithmic sines, cosines, tangents, and cotangents, as well as a wealth of auxiliary mathematical constants.
The longevity of Vega's work—reaching its 61st edition by 1881—attests to its absolute reliability. In an era when a single misprint could lead to failed architectural projects or navigational errors, "Vega's Tables" were synonymous with mathematical truth. This Russian-language edition highlights the international reach of German scientific publishing and the demand for precise technical tools in the Russian Empire during its period of rapid industrial and scientific growth.
For historians of mathematics, collectors of scientific instruments, and bibliophiles, this large-format Berlin imprint is a quintessential example of the "bibles of calculation" that powered the Industrial Revolution. It serves as a tangible link to a time when human genius and manual calculation were the primary engines of technological progress.