Columbia subject headings:
Rousseau, Jean-Jacques, 1712-1778.
Unamuno, Miguel de, 1864-1936.
Harvard subject headings:
Rousseau, Jean-Jacques, 1712-1778
Unamuno, Miguel de, 1864-1936
Princeton subject headings:
Rousseau, Jean-Jacques, 1712-1778.
Unamuno, Miguel de, 1864-1936.