Before these brilliant expositions, Minkowski's pioneering writings were accessible only to specialists. This classic two-volume work focuses primarily on geometric problems involving integers and algebraic problems approachable through geometrical insights. It demonstrates the simplicity and elegance of number theory proofs and theorems and illuminates many other algebraic and geometric topics.
Here's a sample of other books in this Dover category
A Treatise on the Differential Geometry of Curves and Surfaces by Luther Pfahler Eisenhart Created especially for graduate students by a leading writer on mathematics, this introduction to the geometry of curves and surfaces concentrates on problems that students will find most helpful.
Continuous Groups of Transformations by Luther Pfahler Eisenhart Intensive study of theory and geometrical applications of continuous groups of transformations features discussions of tensor analysis, Riemannian geometry, and applications of theory of continuous groups to modern physics. 1933 edition.