Betsy-Tacy and Tib, Deep Valley, Minnesota, 10 books in all, culminating in 1955 with Betsy's Wedding.
I didn't discover these books until about age 10 or 11, and when I did they were already in high school -- Betsy Was a Junior. It immediately became one of my most re-read volumes on our tiny rural school library's shelves. So the young girls -- age 5 when the first book comes out in 1945 -- never much interested me. It was teenage Betsy, Tacy and Tib, in their somehow wondrous lives in my recognizable midwest -- but o, so sophisticated! they lived in Town, not on a farm like I did! -- and also fantastical because they lived so long ago, in a different world that happened before World War I, a war I hardly knew other than my paternal grandfather had been a part of it. Who were these people? I didn't know anyone like them, but now I did, inside these books.
[ "But there may be no world that provokes such profound girlish longing as the bucolic century-old Minnesota of “Betsy-Tacy.” " ]