Columbia subject headings:
Harvard subject headings:
Alsatians--Germany--Biography.
Gay activists--Germany--Biography.
Gay liberation movement--Germany--History--20th century.
Gays--Germany--Biography.
Praetorius, Numa, 1866-1951
Praetorius, Numa, 1866-1951--Diaries.
Wilhelm, Eugen, 1866-1951
Wilhelm, Eugen, 1866-1951--Diaries.
Princeton subject headings:
Gays--Germany--Biography.
Praetorius, Numa, 1866-1951.
Wilhelm, Eugen, 1866-1951.