Columbia subject headings:
Frege, Gottlob, 1848-1925.
Meaning (Philosophy)--History--20th century.
Russell, Bertrand, 1872-1970.
Harvard subject headings:
Frege, Gottlob, 1848-1925.
Meaning (Philosophy)--History--20th century.
Russell, Bertrand, 1872-1970
Princeton subject headings:
Frege, Gottlob, 1848-1925.
Meaning (Philosophy)--History--20th century.
Russell, Bertrand, 1872-1970.