Columbia subject headings:
Harvard subject headings:
Hauk, Minnie, 1851-1929.
Hesse-Wartegg, Ernst von, 1854-1918.
Singers--Switzerland--Biography.
Travel writers--Switzerland--Biography.
Princeton subject headings:
Hauk, Minnie, 1851-1929.
Hesse-Wartegg, Ernst von, 1854-1918.
Singers--Swtizerland--Biography.
Travel writers--Switzerland--Biography.