Columbia subject headings:
Harvard subject headings:
Bergmann, Gustav, 1906-
Carnap, Rudolf, 1891-1970
Logical positivism.
Ontology.
Realism.
Princeton subject headings:
Bergmann, Gustav, 1906-1987.
Carnap, Rudolf, 1891-1970.
Logical positivism.
Ontology.
Realism.