01000cam a2200289Ia 4500005755004MiAaHDL20071127000000.0m d cr bn ---auaua040613s1929 xx a b 000 0 eng dsdr-wu6308886(OCoLC)55642902GZMGZMAWN335Nelson, Martin Johan,1894-The differences in the achievement of elementary school pupils before and after the summer vacation /by Martin J. Nelson.1929.48 p. :ill. ;23 cm.Bureau of Educational Research bulletin ;no. 10Cover-title.Thesis (Ph.D.)--University of Wisconsin--Madison, 1929.Includes bibliographical references.Mode of access: Internet.Educational tests and measurements.Education.Ability.Vacations.Dissertations, AcademicEducation.00575500420071126120654.020071127000000.020120815134330.02025-02-18T19:33:32ZSDR-WUUNKNOWNloader.pl-001-001BKsdr-wu6308886wuSDRWUwu.89079949418WU6308886WUWU20250218googlewu.890799494181929pdusbibnon-US bib date1 between 1901 and 1931