Free to read

William Stein

3 free books by William Stein.

A Brief Introduction To Classical And Adelic Algebraic Number Theory
2004 · 2004 · Read at legacy-www.math.harvard.edu ↗
Algebraic Number Theory, a Computational Approach
2007 · 2007 · Read at www.williamstein.org ↗
Elementary Number Theory: Primes, Congruences, and Secrets
2008 (2017 update) · 2017 · Read at wstein.org ↗