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020 _a0566041422
082 _a620.0042 HEA
100 _aHead, George O
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245 _aAutocad 3D companion: the illustrate guide to autocad's third dimension / George O. Head.-2nd ed.
250 _a2E
260 _aVentana Press
650 _aSystems engineering-mathematical models
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999 _c1610
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