Ad Access at Duke University Libraries.
Adviews: A Digital Archive of Vintage Television Commercials.
Calisphere: Digital collection of images from California libraries.
Medicine and Madison Avenue: Advertisements from 1850 to 1920. From Duke University.
R. C. Maxwell Company Records, 1904-1990s: Photographs of billboards and other outdoor advertising, mostly on the Atlantic City Boardwalk. Duke University site.
Resource of Outdoor Advertising Descriptions: Portal to more than 30,000 images of outdoor advertising from five different source collections. Duke University site.
Retronaut: Vintage advertisements.