"Context is Key: How (and why) you should write about outdoor advertising"
Big, International companies
Clear Channel Outdoor
The Outdoor Advertising Association of America
F.E.P.E. International (International Federation of Outdoor Adverting)
Digital Signage Connection
The Library of Congress’ digital archive of photographs of “Roadside America” taken by John Morgolies between 1969 and 2008
Duke University’s “Resource of Outdoor Advertising Descriptions (R.O.A.D.) 2.0,” a digital database with descriptions and links to photographs of American outdoor advertisements from the 1880s through the 1990s.
The National Library of Australia’s “Victorian Railways outdoor advertising, between 1910 and 1950" collection