Hempel, Carl Gustav, 1905- Philosophy of natural science / [by] Carl G. Hempel. - Englewood Cliffs, N.J. : Prentice-Hall [1966] - ix, 116 p. ; 23 cm. - Prentice-Hall foundations of philosophy series . Includes bibliographical references. Subjects--Topical Terms: Science--Philosophy. Dewey Class. No.: 501