I think those are a nice start for some MVP system but any one probably would need more fleshing out, especially if you want to make a competitive product. i.e

I think those are a nice start for some MVP system but any one probably would need more fleshing out, especially if you want to make a competitive product. i.e. in a few of the library datanases, book identifcation using ISBN, ISBNs can change by revision also does not adequately handle tracking multiple copies. But I can see these can give you a glimpse of what datasets you will be concerning yourself with.