I am not sure where you saw it before, I just remembered that KayRay had Betsy-Tacy because we listened to them. If you go to her main page (kayray.org) there are other books you may be interested in, but I don't know if they are the ones you are lookng for.
But I never heard that it had been anybody’s business to find out what his natural bent was, or where his failings lay, or to adapt any kind of knowledge to him…..I did doubt whether [he] would not have profited by someone studying him a little, instead of his studying them quite so much. (Dickens, Bleak House)