Columbia subject headings:
Harvard subject headings:
Political prisoners--Germany (East)
Prisoners--Transportation--Germany (East)
Prisons--Germany (East)
Railroads--Germany (East)--Trains.
Princeton subject headings:
Political prisoners--Germany (East)--Biography.
Prisoners--Crimes against--Germany (East).
Prisoners--Transportation--Germany (East).
Prisons--Germany (East).
Railroads--Germany (East)--Trains.