George Eastman’s career developed in a particularly American way. The founder of Kodak progressed from a delivery boy to one of the most important industrialists in American history, and a crucial innovator in photographic history. Eastman died in 1932, and left his house to the University of Rochester. Since 1949 the site has operated as an international museum of photography and film, and today holds the largest collection of its kind in the world, containing over 400,000 images and negatives―among them the work of such masters as Alfred Stieglitz, Edward Steichen, and Ansel Adams. Home also to 23,000 cinema films, five million film stills, one of the most important silent film collections, technical equipment and a library with 40,000 books on photography and film, the George Eastman House is a pilgrimage site for researchers, photographers, and collectors from all over the world. This volume curates the most impressive images from the collection in chronological order to offer an incomparable overview of photographic history.
Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
If an editor is known, however, Various is not necessary. List the name of the editor as the primary author (with role "editor"). Contributing authors' names follow it.
Note: WorldCat is an excellent resource for finding author information and contents of anthologies.