| http://www.w3.org/ns/prov#value | - Routledge is an imprint of Taylor & Francis, an informa company. more...Add to my wish listAdd to cartTheoretical Principles of Distance Educationby Desmond KeeganTaylor and Francis 2005; US$ 210.00According to UNESCO statistics, 10 million of the world's 600 million students study at a distance.
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