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An awareness of the structure of academic concerns and structure at that time is important because later the term "historical" has been interpreted by current views as diachronic. Equation of nineteenth-century "historical" with terms such as "social" or "behavioral" and "human" would be more accurate if these are taken to apply to all the areas not dealt with in the "physical" and "biological" sciences, which themselves cannot be equated directly with the early classification "natural sciences.
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Winfred P. Lehmann (Theoretical Bases Of Indo European Linguistics)