The National Museum of American History blog, O Say can You See? recently featured a wonderful post about the reopening of the Libraries' Dibner Library of the History of Science and Technology and its collection of incunabula.
Image: Beginning of the first book showing a researcher examining two books (sig. C1 recto)
Author: Brunschwig, Hieronymus, ca. 1450-ca. 1512, Title: Kleines Distillierbuch.