"The World War I Pamphlet Collection at the University of Pennsylvania consists of just over 400 titles drawn from the general stacks at Van Pelt library. These pamphlets, many of them brittle and no longer fit for circulation, all deal with the First World War, its origins or aftermath. Out of this collection, more than 200 have been digitized and are made available here in Print at Penn. "

http://dla.library.upenn.edu/dla/print/index.html