Impact on learning outcome by effective use of mathematics textbooks structured for increasing academic learning time: Empirical research in El Salvador
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2012 ◽
2007 ◽
Vol 101
(6)
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pp. 339-350
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1982 ◽
Vol 1
(2)
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pp. 44-55
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1990 ◽
Vol 61
(1)
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pp. 92-95
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