*Merriam-Webster* says about *another* the following:

> 
> *being one more* in addition to one or more of the same kind  
> 
>  —<http://www.merriam-webster.com/dictionary/another>
> 
> 
> 

However, I come across such sentences as: “I am giving another three books away”, “give me another 2 flowers”. I think it’s fine to say “give me another twenty minutes” as it is a period of time, but I wonder about “another two books/flowers”. Is it grammatically correct? Another thing which seems to be suspicious is that I can’t find such examples in dictionaries.