There are numerous readability measures like Flesch Readability test, Wiener Sachtextformel, etc. But is there someplace I could actually find common books listed with their respective reading ease scores? This source could be based on any of the major readability measures (Lesbarkeitsindex), The list would ideally be clearly categorized in terms of type (fiction, non-fiction, specialist texts, etc.).
I am an intermediate learner of German, and I am looking for books that are readable for someone like me. I can imagine such a source of scientifically measured readability would be helpful for all learners, so it would be wonderful if someone can suggest such an information source.