Columbia subject headings:
Russia--Foreign relations--1894-1917.
Sazonov, Sergeĭ Dmitrievich, 1861-1927.
Straits question.
Harvard subject headings:
Russia--Foreign relations--1894-1917.
Sazonov, Sergeĭ Dmitrievich, 1861-1927.
Straits question
Turkish Straits (Turkey)--Strategic aspects.
Princeton subject headings:
Russia--Foreign relations--1801-1917.
Sazonov, Sergeĭ Dmitrievich, 1861-1927.
Straits question.