Hello! 
It is Instrumental singular and you can find similar examples on this page:
Instrumental case, see Uses of the Instrumental, point 5
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Category: Learning Russian 
What case is this? "Этим утром"
lincp - Aug 25, 2015 at 15:20
	
	Этим утром я проснулся в десять часов.
I want to learn what case Этим is in? Dative plural or Instrumental singular masculine?
		Learning Russian 
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	Admin - Aug 25, 2015 at 21:11
		
			

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