Columbia subject headings:
Harvard subject headings:
Fontane, Theodor, 1819-1898
Keller, Gottfried, 1819-1890
Raabe, Wilhelm, 1831-1910.
Princeton subject headings:
Fontane, Theodor, 1819-1898.
Keller, Gottfried, 1819-1890.
Raabe, Wilhelm, 1831-1910.