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The slower, more reliable option. Good for corrections, takedown requests, and anything you'd rather not say in public.

The faster one. Come and say what's missing, what's broken, or what you're reading — we're in there most days.

If something looks wrong, send the link to the page you're looking at. If a book's data is off, the book's own page tells us which source and which id it came from, which is usually all we need to chase it down.