Columbia subject headings:
Harvard subject headings:
Aktion T4 (Germany)
Concentration camp inmates--Austria--Death.
Holocaust, Jewish (1939-1945)--Austria--Hartheim--History.
Schloss Hartheim (Austria)--History.
Princeton subject headings:
Aktion T4 (Germany)
Euthanasia--Austria--History.
Nazi concentration camp inmates--Austria--Death.
People with disabilities--Nazi persecution--Austria.
Schloss Hartheim (Austria)--History.