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JOHNSTON JB, SCH SOC, V19, P772
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MCKNOWN HC, 1913, TREND COLL ENTRANCE, P112
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OTIS AS, 1925, STAT METHOD ED MEASU, P220
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RUGG HO, 1917, STAT METHODS APPL ED, P256
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SYMONDS PM, 1927, MEASUREMENT SECONDAR, P107
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THORNDIKE EL, 1920, REPORT US COMMISSION, P14
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TOOPS HA, J ED PSY, V17, P23
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TOOPS HA, J ED PSY, V17, P110