Trumbull, H. Clay 1830-1903., A model superintendent : a sketch of the life, character, and methods of work of Henry P. Haven of the International Lesson Committee / by H. Clay Trumbull. - Philadelphia : John D. Wattles, (c)1880. - vi, 188 pages : portrait ; 20 cm. Subjects--Personal Names: Haven, Henry P. 1815-1876. LC Class. No.: BV1518 / .M634 1880