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  1. 1

    Foundations of logic and mathematics / by Carnap, Rudolf

    Published 1939
    Book
  2. 2

    Estudios sobre semántica / by Frege, Gottlob

    Published 1973
    Book
  3. 3

    The foundations of arithmetic / by Frege, Gottlob

    Published 1968
    Book
  4. 4

    Truth and consequence in mediaeval logic / by Moody, Ernest A.

    Published 1953
    Book
  5. 5

    Essays on Wittgenstein / by Klemke, E. D.

    Published 1971
    Book