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  1. Philosophy of Science. Part Two: A Study of the Division and Nature of Various Groups of Sciences.P. Henry van Laer - unknown
     
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  2. Philosophy of Science. — Part Two, Duquesne Studies, Philosophical Series.P. Henry Van Laer - 1966 - Revista Portuguesa de Filosofia 22 (4):427-427.
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  3. Philosophico-Scientific Problems.P. Henry van Laer & Henry J. Koren - 1958 - Studia Logica 8:328-331.
     
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  4. The Philosophy of Science. Part One: Science in General.P. Henry van Laer & Henry J. Koren - 1958 - Philosophy of Science 25 (3):223-223.