Columbia subject headings:
Harvard subject headings:
Historians--Germany--Biography--Congresses.
Markov, Walter M.--Congresses.
Markov, Walter M.--Political and social views--Congresses.
World politics--20th century--Congresses
Princeton subject headings:
Historians--Germany--Biography--Congresses.
Markov, Walter M.--Congresses.
Markov, Walter M.--Political and social views--Congresses.
World politics--20th century--Congresses.