Columbia subject headings:
Harvard subject headings:
Mathematicians--Germany--Biography
Physicists--Germany--Biography
Straubel, Rudolf, 1864-1943--Sources.
Straubel, Rudolf, 1864-1943.
Princeton subject headings:
Mathematicians--Germany--Biography.
Physicists--Germany--Biography.
Straubel, Rudolf, 1864-1943--Sources.
Straubel, Rudolf, 1864-1943.