It's pretty clear that the enumeration by subject is based on total ebooks since it shows the total # of ebooks in the library and then shows the total # of Romance books (for example).
I too was surprised at the % showing of Romance books among the libraries I looked at. I suspect that this is driven, in a large part, by the use of the Recommend option by the library members.
I also agree that this Subject listing is only as good as the rigor used in assigning subject tags to books. While there may be errors, I suspect that it is reasonably accurate.
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