Gottingen: Herausgegeben von der Koniglichen Gesellschaft der Wissenschaften zu Gottingen 1863-1874. Seven volumes in three. 11 1/4 x 10 inches. 3/4 leather over green pebbled cloth gilt. Pages edges tinted red.
Firtst volume: , 478 + , 504 + , 499,  pages. Plus one plate. Contains 1. Bd. Disquisitiones arithmeticae. 1863 -- 2. Bd. Höhere Arithmetik. 1863 -- 3. Bd. Analysis. Zweiter Abdruck. 1866
Second volume: , 492 + , 642 pages. Plus one plate. Contains 4. Bd. Wahrscheinlichkeits-Rechnung und Geometrie. Zweiter Abdruck. 1873 -- 5. Bd. Mathematische Physik. Zweiter Abdruck. 1867
Third volume: , 664 + , 290,  pages. Plus one plate. 6. Bd. Astronomie. 1874 -- 7. Bd. Theoria motus corporum coelestium. [Herausgegeben von Ernst Julius Schering] 1871. Very Good. Boards. 
These additional volumes were published later, not present here: 8. Bd. Arithmetik und Algebra. Nachträge zu Band I-III. 1900 -- 9. Bd. Geodäsie. Fortsetzung von Band IV. 1903 -- 10. Bd. 1. Abt. Nachträge zur reinen Mathematik. Nachbildung des Tagebuchs (Notizenjournals) 1796 Mart. 30-1814 Jul. 9. 1917. 2. Abt. Abhandlungen über Gauss' wissenschaftliche Tätigkeit auf den Gebieten der reinen Mathematik und Mechanik. 1922-1933 -- 11. Bd. 1. Abt. Nachträge zur Physik, Chronologie und Astronomie. 1927. 2. Abt. Praktische und sphärische astronomie. 1924-1929 -- 12. Bd. Varia. Atlas des Erdmagnetismus. 1929.
"Johann Carl Friedrich Gauss 30 April 1777 – 23 February 1855) was a German mathematician, geodesist, and physicist who made significant contributions to many fields in mathematics and science. Gauss ranks among history's most influential mathematicians. He is referred to as the "Prince of Mathematicians".
Gauss was a child prodigy in mathematics, and while still a student at the University of Göttingen he propounded several mathematical theorems. Gauss completed his masterpieces Disquisitiones Arithmeticae and Theoria motus corporum coelestium as a private scholar. Later he was director of the Göttingen Observatory and professor at the university for nearly half a century, from 1807 until his death in 1855.
Gauss published the second and third complete proofs of the fundamental theorem of algebra, made contributions to number theory and developed the theories of binary and ternary quadratic forms. He is credited with inventing the fast Fourier transform algorithm and was instrumental in the discovery of the dwarf planet Ceres. His work on the motion of planetoids disturbed by large planets led to the introduction of the Gaussian gravitational constant and the method of least squares, which he discovered before Adrien-Marie Legendre published on the method, and which is still used in all sciences to minimize measurement error. He also anticipated non-Euclidean geometry, and was the first to analyze it, even coining the term. He is considered one of its discoverers alongside Nikolai Lobachevsky and János Bolyai. Furthermore, Gauss invented the heliotrope in 1821, a magnetometer in 1833, and alongside Wilhelm Eduard Weber, invented the first electromagnetic telegraph in 1833. Gauss was a careful author and refused to publish incomplete work, and though having published extensively, he left a substantial number of posthumous works. Gauss was known to dislike teaching, but some of his students became influential mathematicians. He believed that the act of learning, not possession of knowledge, granted the greatest enjoyment." (Wikipedia)