**Books** on Number Theory :

Legendre, Gauss, Jacobi, Dirichelet-Dedekind, Kronecker, Minkowski, Hilbert , Hensel, Hecke, Weyl, Hasse, Artin, Artin-Tate, Lang, Weil, Iwasawa, Serre, Serre, Serre, ..., Tate, Cassels, Swinnerton-Dyer, Manin-Panchiskin, Neukirch, Borevich-Shafarevich, Fröhlich-Taylor, Kato-Kurokawa-Saito, Goldfeld...

If you still have some money, go in for the **collected papers** of arithmeticians 

Gauss, Dirichelet, Eisenstein, Kummer, Riemann, Kronecker, Minkowski, Hilbert, Ramanujan, Takagi, Hasse, Hecke, Siegel, Artin, Weil, Iwasawa, Shafarevich, Serre, Manin, Tate (whenever they're published)

and **conference proceedings**, among them

Cassels-Fröhlich, Fröhlich, Cornell-Silverman, Borel-Casselmann, Jannsen-Kleiman-Serre, Cornell-Silverman-Stevens, Conrad-Rubin, Popescu-Rubin-Siverberg, Sarnak-Shahidi

and arithmeticians' **diaries**

Gauss, Hasse, 

and their **correspondence**

Hasse-Artin, Serre-Tate (worth the wait)

Finally, the **history**

Weil, Dieudonné