I found a book on Google Books about my g-g-grandfather. [View all]

I searched for his name and his wife's and lo and behold, a book came up called "Outline of the family of Blablabla and Blabla, his wife, of Blablabla, married on suchandsuch date in SoandSo City, Pennsylvania." There is no doubt that this is them. However, the entry says "No preview available" and No reviews and when I search every link they have for locating the book, none of them can find it. So where did this entry come from?? Does it mean there really is a book out there somewhere about my gg-grandparents? I've written to the counties associated with the family but none of them could locate a book with that name in their files or in the local historical libraries. How frustrating!!

Does anyone know where the entries for Google Books like this could come from? How did that entry get there?