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- catalog contributor b100514.
 - catalog created "1951.".
 - catalog date "1951.".
 - catalog date "1975".
 - catalog dateCopyrighted "1951.".
 - catalog description "Bibliography: leaves 254-256.".
 - catalog description "Thesis (Ph.D)--Columbia University, 1951.".
 - catalog extent "ii, 256 leaves.".
 - catalog issued "1951.".
 - catalog issued "1975".
 - catalog language "eng".
 - catalog subject "Helmholtz, Hermann von, 1821-1894 Philosophy.".
 - catalog subject "Helmholtz, Hermann von, 1821-1894 Views on the theory of knowledge.".
 - catalog subject "Knowledge, Theory of.".
 - catalog subject "Science Philosophy.".
 - catalog title "The philosophical work of Hermann von Helmholtz : the philosophy and epistemology of the German scientist / by H. Russell Kahl.".
 - catalog type "text".