Columbia subject headings:
Rio de Janeiro (Brazil)--Social conditions.
Riots--Brazil--Rio de Janeiro--History--20th century.
Smallpox--Vaccination--Social aspects--Brazil--Rio de Janeiro.
Harvard subject headings:
Riots--Brazil--Rio de Janeiro--History--20th century.
Vaccination--Brazil--Rio de Janeiro--History--20th century.
Vaccination--Government policy--Brazil--History--20th century.
Princeton subject headings:
Riots--Brazil--Rio de Janeiro--History--20th century.
Vaccination--Brazil--Rio de Janeiro--History--20th century.
Vaccination--Government policy--Brazil--History--20th century.