Columbia subject headings:
Fechner, Gustav Theodor, 1801-1887.
Naturalists--Germany--Biography.
Philosophers--Germany--Biography.
Harvard subject headings:
Fechner, Gustav Theodor, 1801-1887
Naturalists--Germany--Biography.
Philosophers--Germany--Biography
Scientists--Germany--Biography
Princeton subject headings:
Fechner, Gustav Theodor, 1801-1887.
Naturalists--Germany--Biography.
Philosophers--Germany--Biography.