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O'Shea, Tim and Hawkridge, David (1987). Study Guide 2. Block D: Further issues in educational computing. Units 14-16. (EH221 Educational Computing). The Open University, Milton Keynes.
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O'Shea, Tim and Hawkridge, David (1987). Study Guide 2. Block D: Further issues in educational computing. Units 14-16. (EH221 Educational Computing). The Open University, Milton Keynes.