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  1. 1
    af Barr, Arvil Sylvester 1892-
    Udgivet 1947
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    Supervision democratic leadership in the improvement of learning
  2. 2
    af Barr, Arvil Sylvester 1892-
    Udgivet 1938
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    Supervision principles and practices in the improvement of instruction
  3. 3
    af Barr, Arvil Sylvester 1892-
    Udgivet 1931
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    An introduction to the scientific study of classroom supervision.
  4. 4
    af Ayer, Fred Carleton 1880-
    Udgivet 1928
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    The organization of supervision an analysis of the organization and administration of supervision in city school systems
  5. 5
    af Barr, Arvil Sylvester 1892-
    Udgivet 1926
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    The supervision of instruction a general volume
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