Below is a list of a sampling of open access digital primary sources that I have found to be useful for teaching design history. I will continue to add to this list over time and welcome suggestions.
Building Technology Heritage Library
Cornell HipHop Flyer Collections
Cornell Punk Flyers Collections
Harvard Bauhaus Special Collections
International Advertising and Design Database
Library of Congress World War I posters
MAK journals (historic Austrian art and design journals)
Monoskop’s Collection of Avant-Garde Magazines
New York Public Library Digital Collections
Pan American World Airways Records
Wisconsin Library for the Decorative Arts and Material Culture
Jennifer Kaufmann-Buhler 