Hempel, Carl Gustav, 1905-1997 Fundamentals of concept formation in empirical science / by Carl G. Hempel. - Chicago : University of Chicago Press, c1969 - iii, 93 p. ; 23 cm - International encyclopedia of unified science ; 2, no.7 . Includes bibliographical references (p. 88-93). Subjects--Topical Terms: Ciencia--Filosofía Universal Decimal Class. No.: 001.1