Columbia subject headings:
Bohr, Niels, 1885-1962.
Einstein, Albert, 1879-1955.
Quantum theory.
Harvard subject headings:
Bohr, Niels, 1885-1962.
Einstein, Albert, 1879-1955
Quantum theory.
Princeton subject headings:
Bohr, Niels, 1885-1962.
Einstein, Albert, 1879-1955.
Quantum theory.