When Smithsonian Libraries’ material is placed on exhibition, all selected objects are reviewed for display. In some cases, conservation treatment is required in order to make it possible for a book to be opened and pages turned without damaging the structure. Other factors such as conditions for temperature, relative humidity, and light levels in the exhibition gallery are reviewed before allowing items to be exhibited for any length of time. The Dibner Library’s large and important volume of John William Norie’s Marine atlas is the centerpiece of an upcoming exhibition at the National Museum of American History – and was subject to the required conservation review.