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1981 2000 2003 2005 2011 2016 2017
(Cohen, Ebeling, & Kulik, Bonham, Deardorff, & ( YouTube
)Beichner, 2003
)1981
)Baker, 2000( (YouTubeStatistics,” )VanLehn, 2011( Tuition and Fees “(
.)2016 .)2016-2017,” 2016
Tuition and Fees “(
.)2016-2017,” 2016
