Columbia subject headings:
Gravitation.
Hegel, Georg Wilhelm Friedrich, 1770-1831--Knowledge and learning.
Newton, Isaac, 1642-1727.
Physics.
Harvard subject headings:
Gravitation.
Hegel, Georg Wilhelm Friedrich, 1770-1831--Knowledge--Physics.
Newton, Isaac, 1642-1727
Newton, Isaac, 1642-1727.
Princeton subject headings:
Gravitation.
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Newton, Isaac, 1642-1727.