There has been data ("Zaglada chorych psychicznie w Polsce / Die Ermordung der Geisteskranken in Polen / L'extermination des malades mentaux sous l'occupation allemande / Extermination of Psychiatric Patients by the Nazis in Poland: 1939-1945") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Fri Jan 3 13:47:51 2020, so the data displayed here has been removed .