Columbia subject headings:
Bühler, Karl, 1879-1963.
Messer, August, 1867-1937.
Watt, Henry J. (Henry Jackson), 1879-1925.
Harvard subject headings:
Bühler, Karl, 1879-1963.
Messer, August, 1867-
Watt, Henry Jackson, 1879-1925.
Princeton subject headings:
Bühler, Karl, 1879-
Messer, August, 1867-
Watt, Henry Jackson, 1879-1925.