00648nam a2200193Ia 450000100060000000300050000600500170001100800410002801000200006905000170008908200200010611001040012624500860023026000790031630000100039535000090040550000110041465000290042584901BIBL20160527203649.0700925s1970    dcu           00100 eng    a 79131907 //r880 aLB2822b.N39  a372.1/2/012097320aNational Education Association of the United States.bDept. of Elementary School Principals.2Local14aThe assistant principalship in public elementary schools--1969ba research study.0 a[Washington]bNational Association of Elementary School Principalsc[1970]  a96 p.  a4.00  a920901 0aSchool principals2Local