Stump the Bookseller can help. It’s a fee-based online information exchange hosted by Loganberry Books in Shaker Heights, Ohio. What a cool place Harriett Logan’s used bookstore must be—home to a bindery and an art gallery.
In Loganberry’s free question-and-answer archives I found the title of a middle-grade novel I borrowed from a public library in the 1960s. For $150 I can buy Hilary’s Island on eBay now. I almost wish I didn’t know.