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This question already has an answer here:

I could not find 'Add GRASS vector layer' button in QGis 2.16.2 with GRASS 7.0.4? Can someone help?

marked as duplicate by AndreJ, Andre Silva, Hornbydd, Midavalo, PolyGeo Sep 5 '16 at 21:59

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I think that button has been depreciated for some time. You can follow the instructions described in:

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