Der Weltraum und seine Rätsel

History of loss: stored at Michaelstein, Harz. Destroyed by bombing or the effects of war or could no longer be found after 1945. Return in June/July 1945 only partially successful. The volumes listed are still missing today. Lost by the Soviet Military Administration of Saxony-Anhalt in 1948. Presumably (!) today in the Russian National Library, St. Petersburg.