Pre-war correspondence is from Radość; post-war correspondence is from Tiflis.
G.335: 1930-57. On research and publications by Walfisz and S. Chowla, and including two drafts of paper by Chowla 'On the class-numbers of binary quadratic forms' (in Walfisz's hand) and copy of letter by Walfisz to Chowla.
G.336: 1949, 1954, 1956–57. Brief correspondence, mainly on exchange of reprints.