Columbia subject headings:
Harvard subject headings:
Rickettsial diseases.
World War, 1914-1918--Campaigns--Caucasus
World War, 1914-1918--Campaigns--Turkey, Eastern.
World War, 1914-1918--Caucasus.
Princeton subject headings:
Rickettsial diseases.
World War, 1914-1918--Campaigns--Caucasus.
World War, 1914-1918--Campaigns--Turkey, Eastern.
World War, 1914-1918--Caucasus.