Columbia subject headings:
Harvard subject headings:
Ambassadors--Germany--Correspondence.
Diplomats--Germany--Biography
Germany--Foreign relations--20th century--Sources.
Germany--Foreign relations--Soviet Union.
Nadolny, Rudolf, 1873-1953--Correspondence.
Soviet Union--Foreign relations--Germany.
Princeton subject headings:
Ambassadors--Germany--Correspondence.
Diplomats--Germany--Biography.
Germany--Foreign relations--20th century--Sources.
Germany--Foreign relations--Soviet Union.
Nadolny, Rudolf, 1873-1953--Correspondence.
Soviet Union--Foreign relations--Germany.