To find any of the titles in a library near you, see below:
(And, there's even a DS game!)
A few other random links --
A search of the blogosphere revealed this adorable blog about American Girl dolls and books written by two ten-year-olds (which makes me a bit sad that blogs didn't exist when I was 10)
Also, weirdly, when I looked at the Wikipedia page for American Girl, I found some possible errors, such as "The stories were originally written by author Daniel Steele"
*This may, in fact, have been the very first American Girl catalog ever.