In 1955, the Kenneth Spencer Research Library at the University of Kansas presented an exhibition compiled by librarian Robert Vosper on intellectual freedom and the banning of books. Demand for the exhibition catalog was so great that it was reprinted until over 20,000 copies had been distributed. Alexandra Mason and Richard Clement issued this electronic edition of the catalog to "continue the travels of this exhibition and reaffirm our commitment to free enquiry." The electronic catalog is a descriptive bibliography of books banned in England, Germany, Russia, France, Spain, and the United States, and includes images. Given this range, the catalog provides good examples of printing and illustration of books from the early seventeenth century through the first half of the twentieth, along with thought-provoking commentary on book-banning.