No one wants to throw away books, so people pass them along to others. A used book is as good as a new copy, as long as all the pages are there and it's not disgustingly moldy. So we read books that have been read before, and sometimes we find notes jotted in them. Some are informative, others inexplicable, and some are just plain funny. Atlas Obscura asked its readers to submit the strangest notes they've found in books, and they responded with both stories and pictures. These include criticisms, recommendations, dedications, communications out of context, marginalia, snark, spoilers, secret code, and jokes. Some tell stories, while others only hint at the story behind it. Read them all at Atlas Obscura.
(Image credit: Annie Watts)