His second book, written with Walter Rabus, "The Wehrmacht War Crimes Bureau", was published in Germany by Universitas/, in 1979, and the English translation by de Zayas himself by the University of Nebraska Press in 1989. This describes some of the work of the "Wehrmacht-Untersuchungsstelle", a special section of the legal department of the "Oberkommando der Wehrmacht", which investigated Allied and German war crimes. The authors argue that the Bureau carefully investigated war crimes and was largely free of Nazi ideology. De Zayas was the first researcher to work with the 226 extant volumes (about half of the total, the rest apparently having been burned in Langensalza, Germany, near the end of the war.). The book was savagely attacked in the media of the Soviet Union and its satellites.