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1 | Bell, Gordon The secrets of successful speaking and business presentations / Gordon Bell . — London : Heinemann Professional Publishing, 1987. — 160 p. : il. ; 23 cm. — |
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1 | Bell, Gordon The secrets of successful speaking and business presentations / Gordon Bell . — London : Heinemann Professional Publishing, 1987. — 160 p. : il. ; 23 cm. — |