Internal Reports
The following reports were published in Kernphysikalische Forschungsberichte (Research Reports in Nuclear Physics), an internal publication of the German Uranverein. The reports were classified Top Secret, they had very limited distribution, and the authors were not allowed to keep copies. The reports were confiscated under the Allied Operation Alsos and sent to the United States Atomic Energy Commission for evaluation. In 1971, the reports were declassified and returned to Germany. The reports are available at the Karlsruhe Nuclear Research Center and the American Institute of Physics.
- Erica Cremer and Karl Wirtz Untersuchungen des Schwerwassergehaltes einiger technischer Elektrolyseure in Deutschland G-21 (21 June 1940)
- Karl Wirtz Bericht II. Eine 10-stufige Elektrolyseuranlage zur Gewinnung von schwerem Wasser G-61 (19 January 1940)
- Fritz Bopp, Erich Fischer, Werner Heisenberg, Carl-Friedrich von Weizsäcker, and Karl Wirtz Untersuchungen mit neuen Schichtenanordnungen aus U-metall und Paraffin G-127 (March 1942)
- Werner Heisenberg, Fritz Bopp, Erich Fischer, Carl-Friedrich von Weizsäcker, and Karl Wirtz Messungen an Schichtenanordnungen aus 38-Metall und Paraffin G-162 (30 October 1942)
- Karl Wirtz Die elektrolytische Schwerwassergewinnung in Norwegen G-198 (26–28 February 1942)
- Karl Wirtz Einrichtung der Elektrolyse zur Aufbearbeitung von schwerem Wasser G-296 (8 August 1944)
- Fritz Bopp, Walther Bothe, Erich Fischer, Erwin Fünfer, Werner Heisenberg, O. Ritter, and Karl Wirtz Bericht über einen Versuch mit 1.5 to D2O und U und 40 cm Kohlerückstreumantel (B7) G-300 (3 January 1945)
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