You have chosen 'Causal Powers' by Harré,R./Madden,E.H, 'Types and Ontology' by Fred Sommers and 'Elucidation of some points in E.Schrder' by Gottlob Frege
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |