Columbia subject headings:
Harvard subject headings:
Revolutionaries--Soviet Union--Biography
Revolutionaries--Soviet Union--Correspondence
Zalomov, Petr--Correspondence.
Zalomov, Petr.
Princeton subject headings:
Revolutionaries--Soviet Union--Biography.
Revolutionaries--Soviet Union--Correspondence.
Zalomov, Petr--Correspondence.
Zalomov, Petr.