When I was a Girl Scout Summer Camp counselor, one of the girls in my cabin had Howliday Inn and I read it one afternoon during our down time. It impressed me so much, I wound up buying the first three in the series.

I remember reading a lot of Greco-Roman myths as a child, as well as the Tizz a Pony series, pretty much anything by Walter Farley (or horse books in general), any of the collie series by Terhune, the Magic series by Edgar Eager, the family Pye series...there were a lot of series, weren't there?