Pen and parchment : drawing in the Middle Ages / Melanie Holcomb ; with contributions by Lisa Bessette, Barbara Drake Boehm, Evelyn M. Cohen, Kathryn Gerry, Ludovico V. Geymonat, Aden Kumler, Lawrence Nees, William Noel, Wendy A. Stein, Faith Wallis, Karl Whittington, Elizabeth Williams, and Nancy Wu :: Metropolitan Museum of Art Publications
That moment when you click on a link for a book, fully expecting to be taken to an Amazon or University Press page, but instead get a digitized copy with a download link.
So please enjoy Pen and Parchment: Drawing in the Middle Ages, by Melanie Holcomb in conjunction with the Metropolitan Museum of Art.
The MOMA has a lot of books to download, actually. It was just nice to stumble on this one unexpectedly.