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| 74 | | L44 |
Leadership in Middle Level Education [Текст]. V. I : A National Survey of Middle Level Leaders and Schools / Jerry W. Valentine, Donald C. Clark, Judith L. Irvin, James W. Keefe, George Melton. – Reston, Virginia : National Association of Secondary School Principals, 1993. – 300000.00.
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| ISBN 088210-274-5 | УДК 37
ББК 74 |
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