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The foundation of mathematics
Heerden, Pieter Jacobus van
Bok Engelsk 1968
The foundation of empirical knowledge : with a theory of artificial intelligence
Heerden, Pieter Jacobus van
Bok Engelsk 1968
The foundation of physics : With a proposal for a fundamental theory of physics
Heerden, Pieter Jacobus van
Bok Engelsk 1967