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4 Kasım 2018
Kaynak:
http://grayff.org/wp-content/uploads/2018/05/Empirical-Evidence-Supporting-Benefits-of-Outdoor-School-and-Experiential-Learning-Programs_March-2015.pdfhttp://grayff.org/wp-content/uploads/2018/05/Empirical-Evidence-Supporting-Benefits-of-Outdoor-School-and-Experiential-Learning-Programs_March-2015.pdf :
