4 books • 3 series
Book #174: Linear and Regular Celestial Mechanics
Book #11: Lehrbuch Der Darstellenden Geometrie
Book #2: Programmgesteuerte Digitale Rechengerate (Elektronische Rechenmaschinen)
Book #8: Refined Iterative Methods for Computation of the Solution and the Eigenvalues of Self-Adjoint Boundary Value Problems