This picture is of my 1976 edition Our Bodies, Ourselves book. It's probably kind of a silly prized possession, as this same book can be had on Amazon Marketplace for $.01, but it is a prized possession anyway. I also have a mimeographed copy of the much less accessible first edition of the book, but it doesn't make as pretty a picture.
I got this book while I was writing my undergraduate thesis, which was about Our Bodies, Ourselves and Ms. magazine's health care coverage in the 1970s. And honestly, I probably did get it from Amazon for $.01 or similar. But it's not monetary value that draws me to it, it's what it stands for. Our Bodies, Ourselves was and continues to be an amazing project, and it was with this edition that I learned about that. Plus it's just a really cool old hippy book. I recently added the 1978 Ourselves and Our Children (found at the Goodwill) to my collection, and it's quickly becoming a prized possession too.