Some numbers of the Bulletin consist of: 1940-1942, National Association of Secondary School Principals (U.S.). Proceedings of the ... annual meeting of the National Association of Secondary School Principals of the National Education Association (1940); 1947-1963, National Association of Secondary School Principals (U.S.). Proceedings of the ... annual convention; 1964-1966, National Association of Secondary School Principals (U.S.). Annual convention; 1967- , National Association of Secondary School Principals (U.S.). Some papers from the ... annual convention.