Tholfsen, Trygve R. Historical thinking; an introduction [by] Trygve R. Tholfsen. - New York, Harper & Row 1967 - viii, 328 p. 21 cm. Includes bibliographies. LCCN: 67015792 Subjects--Topical Terms: History--Methodology. LC Class. No.: D 16 / T451h 1967 Dewey Class. No.: 907.2