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  1. Autodesk Community, Autodesk Forums, Autodesk Forum

  2. Autocad [2007-2009] User manual - Archive.org

  3. Autodesk

  4. Mastering AutoCAD 2007 and AutoCAD LT 2007 - Google Books

  5. AutoCAD 2007 For Dummies - David Byrnes, Mark Middlebrook

  6. Autodesk AutoCAD LT 2007 05727-091452-9300 User Manual

  7. Getting started with AutoCAD | Autodesk

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