Paper Knowledge is a remarkable book about the mundane: the library card, the promissory note, the movie ticket, the PDF (Portable Document Format). It is a media history of the document. Drawing examples from the 1870s, the 1930s, the 1960s, and today, Lisa Gitelman thinks across the media that the document form has come to inhabit over the last 150 years, including letterpress printing, typing and carbon paper, mimeograph, microfilm, offset printing, photocopying, and scanning. Whether examining late nineteenth century commercial, or "job" printing, or the Xerox machine and the role...