Columbia subject headings:
Harvard subject headings:
Balloon post--France--Paris--History--19th century.
Franco-Prussian War, 1870-1871--Sources
Paris (France)--History--Commune, 1871--Sources.
Paris (France)--History--Siege, 1870-1871--Chronology.
Paris (France)--History--Siege, 1870-1871--Sources.
Paris (France)--In art.
Princeton subject headings:
Franco-Prussian War, 1870-1871--Sources.
Paris (France)--History--Commune, 1871--Sources.