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2. Autodesk AutoCAD 2017 help: AutoCAD 2017 new feature summary available athttp://help.autodesk.com/view/ACD/2017/ENU/?guid=GUID‐2158DFA1‐FA3A‐4081‐87E7‐1CB0038AE02F
3. Autodesk Autodesk AutoCAD 2014 DXF reference 2013 available athttp://images.autodesk.com/adsk/files/autocad_2014_pdf_dxf_reference_enu.pdf
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