Columbia subject headings:
Harvard subject headings:
Bacteriologists--Germany--Bio-bibliography--Dictionaries.
Bacteriologists--Russia--Bio-bibliography--Dictionaries.
Bacteriology--Germany--History--19th century.
Bacteriology--Russia--History--19th century.
Hygienists--Germany--Bio-bibliography--Dictionaries.
Hygienists--Russia--Bio-bibliography--Dictionaries.
Immunologists--Germany--Bio-bibliography--Dictionaries.
Immunologists--Russia--Bio-bibliography--Dictionaries.
Immunology--Germany--History--19th century.
Immunology--Russia--History--19th century.
Princeton subject headings:
Germany.
Russia.