The archive, open to scholars, contains letters, scrapbooks, bills, receipts and other ephemera. Bodies of work include literature, music, films, art, archival material and ephemera. Permanent collections include American furnishings, ceramics, silver, textiles and military ephemera. Printed ephemera usually contain various promotional images and texts. Old hand-painted posters, once considered ephemera, are collectible folk art. Online collector catalogs exist to showcase different types of ephemera and provide information to enthusiasts. Some collectable ephemera is listed below. Autobiographical elements also abound; test prints of graphic designs; bus tickets; ephemera given by friends. Historical bookmarks can be very valuable, and are sometimes collected along with other paper ephemera. In 2001, Stern's collection of instruments, bows and musical ephemera was sold through Tarisio Auctions. In 2009 The Forsythe Collection of travel and transport ephemera was acquired for the collection. It also used Gill Sans for printed ephemera, such as timetables. Information and research professionals generally draw a distinction between ephemera and grey literature. The science books are interesting as ephemera of their time. Relatively few of these unwieldy ephemera survive.