Estvan, Frank J. Social studies in a changing world: curriculum and instruction [by] Frank J. Estvan. - New York, Harcourt, Brace & World [1968] - xii, 532 p. illus. 23 cm. Includes bibliographies. LCCN: 68021726 Subjects--Topical Terms: Social sciences--Study and teaching. LC Class. No.: H62 / .E75 Dewey Class. No.: 300/.7 / ESS 1968