Correspondence with: Attorney Sokal from Lvov, delegation of National Council for Jews of East Galicia, Committee for Matters Concerning Eretz Israel in Vienna, Zionist Organization - Copenhagen branch, Zionist Organization - Eretz Israel branch, Jewish newspaper in Stockholm, Keren Kayemet LeIsrael (Jewish National Fund) in Vienna, Arthur Ruppin, Ludwig Infeld, Leo Motzkin, National Council for Jews of Ashkenazi Austria.
Correspondence in German and Polish