Gruhn, William Theodore. The modern junior high school, [electronic resource] / by William T. Gruhn and Harl R. Douglass.. — 2d ed.. — New York, : Ronald Press Co., [1956]. — 421 p. : illus. 24 cm. — (Douglass series in education). LCCN: 56006805 Subjects--Topical Terms: Junior high schools.Écoles secondaires. LC Class. No.: LB1623 / .G7 1956 Dewey Class. No.: 373