What does one learn when we avoid the gravitational field of a book’s content in favor of all the bits of history preserved in a book’s form? There is a rich tradition of studying books as material objects, and indeed there is much to learn from books as books, from the technology and economics of the book trade, to the ways knowledge is shaped or altered by page layout, to the ways the circulation of ideas may be subject to such apparently secondary factors as trade routes or family networks.