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|a Theoretical principles of distance education
|c edited by Desmond Keegan
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| 260 |
|
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|a London
|b Routledge
|c 1993
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| 300 |
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|a xiii, 272 p.
|b ill.
|c 23 cm.
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| 490 |
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|a Routledge studies in distance education
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| 650 |
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|a Distance education
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|a Keegan, Desmond
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