The Little House books someone mentioned above are really nice - my library has a bunch, and Elena loves them. Basically, each one is an abridged chapter - with gorgeous full-color illustrations - from the original source. "Going To Town" is nice, and there's "Summer in the Big Woods" (I think) and "Dance at Grandpa's" and so on.

What about Thornton Burgess? I haven't looked at that series lately, but I see them on the shelf at the library and remember loving them as a child. I don't know how appropriate they'd be..... a lot of anthropomorphized animals, IIRC.

Beverly Cleary has a couple of great memoirs. A Girl From Yamhill is the first one, and I can't remember the second......