Columbia subject headings:
Diplomats--Biography.
Diplomats--Correspondence.
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Germany.
Harvard subject headings:
Diplomats--Biography
Diplomats--Correspondence
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Germany.
Princeton subject headings:
Diplomats--Correspondence, reminiscences, etc.
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Germany.