From site:
We bill ourselves as “A Museum Without Walls… For An Art Without Boundaries.” Even though we have no walls, we do have “floors,” separate areas for different activities. At the bottom of most pages, you’ll find a navigation bar that will let you choose our Exhibitions floor, our Main Entrance floor, our Research Center or our Museum Shops. Just click on the place you want to visit. Or click on the Museum’s logo and you’ll find yourself transported to our Home Page.
In the Research Center, you’ll find a very helpful listing of various photographic processes. There’s also a new and important feature, Preserving and Protecting Photographs: A Product Guide. We offer specific recommendations based on our own experience, and provide a link to a key source for archival materials. The Research Center also offers links selected photo-history sites on the web.