Columbia subject headings:
Harvard subject headings:
Gruibingen (Germany)--History--20th century--Sources.
Jehovah's Witnesses--Germany--Gruibingen--Biography.
Jehovah's Witnesses--Nazi persecution
National Socialism--Germany--Gruibingen.
Zanker, Adolf, 1910-1944--Correspondence.
Princeton subject headings:
Gruibingen (Germany)--History--20th century--Sources.
Jehovah's Witnesses--Germany--Gruibingen--Biography.
Jehovah's Witnesses--Nazi persecution.
National socialism--Germany--Gruibingen.
Zanker, Adolf, 1910-1944--Correspondence.