Anderson, Vernon E. Principles and practices of secondary education / Vernon E. Anderson, Paul R. Grim and Willam T. Gruhn. - New York : The Ronald Press, c 1951. - x, 508 p. : ill. ; 24 cm. - Douglass series in education / edited by Harl R. Douglass. . Includes index. 300 300 Subjects--Topical Terms: Education.Secondary education. Dewey Class. No.: 373 / A2544