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by Frege,Gottlob
by Frege, Gottlob; Bynum, Terrell Ward
by Frege, Gottlob; Russell, Bertrand; Sullivan, Arthur
by Frege,Gottlob; Kolak,Daniel
by Frege, Gottlob
by Frege, Gottlob; Long, P.; White, R. M.
by Gottlob Frege