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Free icons for Windows8/Metro
Undo
DarkSlateGray
512x512
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Google Plus Interface Icons
128x128
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Aroma
24x24
Android Developer Common Icon Set II
Undo, selected
32x32
Undo, unselected
Oxygen
Undo, writing, write
48x48
Alerts
Reset, Undo, return
UI
Glyph
Windows 8 metro style
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Mixed
Iconic
Windows 8 icons
26x26
Network & communications
Smooth
Edit, Undo