Columbia subject headings:
Color--History.
Geometry--History--19th century.
Geometry--Philosophy.
Helmholtz, Hermann von, 1821-1894.
Kant, Immanuel, 1724-1804.
Kant, Immanuel, 1724-1804. Metaphysische Anfangsgründe der Naturwissenschaft.
Harvard subject headings:
Color--History.
Geometry--History--19th century.
Geometry--Philosophy.
Helmholtz, Hermann von, 1821-1894.
Kant, Immanuel, 1724-1804
Kant, Immanuel, 1724-1804. Metaphysische Anfangsgründe der Naturwissenschaft.
Princeton subject headings:
Geometry--Philosophy.
Helmholtz, Hermann von, 1821-1894.
Kant, Immanuel, 1724-1804.