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HAMMOCK OWINGS, . (1955). SUPERVISING INSTRUCTION IN SECONDARY SCHOOLS. N.Y: MCGRAW.
HAMMOCK OWINGS, . 1955. SUPERVISING INSTRUCTION IN SECONDARY SCHOOLS. N.Y: MCGRAW.
HAMMOCK OWINGS, . SUPERVISING INSTRUCTION IN SECONDARY SCHOOLS. N.Y: MCGRAW. 1955.