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From SofTutor for AutoCAD 2D - Refedit Command For Editing Reference Files
Topics and keywords covered in this video are:

In-place Xref and Block Edit Command New Modify Pulldown Properties Change
Inserting A Reference File New Properties Change Insert Dim Xref
Accessing The Refedit Toolbar New Properties Change Insert Dim Xref
Editing Reference Files With REFEDIT Command New Properties Change Insert Dim Xref