Columbia subject headings:
Influenza Epidemic, 1918-1919.
Influenza--History.
Influenza--Social aspects.
Harvard subject headings:
Influenza Epidemic, 1918-1919
Influenza--History.
Influenza--Social aspects.
Princeton subject headings:
Influenza Epidemic, 1918-1919.
Influenza--History.
Influenza--Social aspects.