Columbia subject headings:
Amusement parks--Germany--Pictorial works.
Fairs--Germany--Pictorial works.
German wit and humor, Pictorial.
Postcards--Germany.
Harvard subject headings:
Amusement parks.
Fairs--History--Pictorial works.
Manners and customs.
Postcards.
Princeton subject headings:
Amusement parks.
Fairs--History--Pictorial works.
Manners and customs.
Postcards.