Michael Popek runs Popek's Used and Rare Books in Oneonta, N.Y. As you can imagine, he comes across quite a few interesting papers and bookmarks while sorting through the books he acquires. He started posting a few of the more memorable ones online for his friends, and word of his blog quickly spread. I'm definitely a fan; his site, Forgotten Bookmarks, is a treasure trove of the humorous, the poignant and the downright perplexing.
Here are a few of my favorites:
Fractional currency; a ten cent note, series of 1874. Found in The Posthumous Papers of the Pickwick Club by Charles Dickens. Published by Hurst and Co., circa 1880.
Sensation brand hair net, made from natural human hair. (Yeuch!) Found in Elements of Mechanics and Machine Design by Erik Oberg. Published by The Industrial Press, 1923.
Found in George Eliot's Life by J.W. Cross. Published by Harper and Brothers, 1885.