I'd agree--I was a librarian in a public library in the American Midwest for 30 years. We had it in adult fiction. My recollection is that it's a long book. I read it in my twenties, I think, and enjoyed it at that time, though I found it sad (that's actually about all I recall about it at this point--my twenties were a great many years ago!)

One memory associated with that title is of a library patron I liked (we were about the same age, she was a teacher) telling me how she'd been crying while reading it and her husband had said in an exasperated tone: "Joleen, it's just a bunch of rabbits!"