If you only want to read them, check out the library. Keira has read probably 30 AG books, they have so many different ones.
Most of the historical dolls have 6 books in a series.
This might help, it lists all of the girls that have been retired, dolls of the year, and a brief story summary.
http://www.americangirl.com/corporate/archives
Here's another list.
http://americangirl.wikia.com/wiki/H...cal_Characters