So what are the "must read" books on LibriVox?

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Who else "reads" by LibriVox (free audiobooks in the public domain)? I really like some of their readers. Kara Shallenburg is awesome! I loved reading Heidi, A Little Princess, and what I've read of The Secret Garden. Other things are read by multiple readers, and I didn't like them as much (especially if they started with good readers and then switched so that I couldn't understand someone's accent and thus the ending was lost). Call of the Wild comes to mind, even though it was actually fairly good. I'm currently reading Einstein's Theory of Relativity, and I guess I didn't expect the readers to be great for that, but they're not bad. In any case, the books are free and everyone on there reads better than I do. But I was just wondering if anyone has some recommendations of books that are just really really good on LibriVox. I'd definitely recommend anything read by Kara Shallenburg myself. If you haven't checked out LibriVox yet and you like audiobooks, it's at www.librivox.org