Columbia subject headings:
Romanies--Germany--History--20th century.
Romanies--Nazi persecution--Germany.
Harvard subject headings:
Germany, Northern--History--20th century.
Germany--History--1933-1945--Sources.
Nazi concentration camp inmates--Germany--Correspondence
Romanies--Germany--History--20th century.
Romanies--Nazi persecution--Germany
Princeton subject headings:
Romanies--Germany--History--20th century.
Romanies--Nazi persecution--Germany.