Columbia subject headings:
German literature--History and criticism.
Prisoners' writings, German--History and criticism.
Prisoners' writings, German.
Prisons--Germany--History--Sources.
Harvard subject headings:
German literature--History and criticism
Prisoners' writings, German--History and criticism.
Prisoners' writings, German.
Prisons--Germany--History--Sources.
Princeton subject headings:
Prison reformers--Germany--History.
Prisoners' writings--Germany--History and criticism.
Prisons--Germany--History.