http://quod.lib.umich.edu/l/lbc2ic?cc=lbc2ic;page=index;c=lbc2ic
The Joseph A. Labadie Collection contains posters which have been acquired over the past 100 years. This database consists of images of those posters covering social protest movements such as Anarchism, Civil Liberties, Colonialism, Communism, Ecology, Labor, Pacifism, Sexual Freedom, Socialism, Women, and Youth/Student Protest. Some are from the first half of the 20th century, but the majority are from the 1960s and later. Many are undated. All originals are held in the Joseph A. Labadie Collection.
We are pleased to provide high resolution files for a selection of these posters in the public domain, that is posters for which there is no copyright. These files may be used for any purpose without permission of any sort though attribution is welcome and consistent with academic norms.
Maybe worth mining…